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Picture of How To Make Your Own Sugru Substitute
I call it Oogoo, an inexpensive silicone clay that is easily made. It can be used as an excellent substitute for Sugru. It can be hand molded or cast in forms. Or, it can be used as a casting silicone. It can be colored any color from white to black. It can also be made translucent to allow diffused light to shine through. It can even be painted on in thin layers. It has very good adhesive qualities and will stick to itself, glass, fabric, paper, wood, and some plastics and metals.

This instructable will show :

1- How to mix and color Oogoo

2- How to cast it or hand form it into different shapes.

3- How to make silicone paint

4- Several interesting uses for Gorilla tape and Gorilla Glue, see steps 3, 7, 12 and 15.

5- How to make a few projects using Sugru and a comparison of Oogoo and Sugru


Since I am mainly interested in using Oogoo to embed electronic circuits in flexible forms, this instructable will also show you how to:

1- Make a soft circuit LED pumpkin head robot display that can be embedded on to clothing.

2- Make cleanly etched conductive fabric circuits

3- Make conductive glue using Gorilla glue.

4- Embed circuits in Oogoo or Sugru


The intro pic shows a few of the silicone shapes that I made using Oogoo and a funky, smirky, flexible pumpkin head robot LED display.


 
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Step 1: How It Works

Picture of How It Works
pic2 shows a 2"x2"x2" solid silicone cube that cured enough in two hours to be removed from its plastic box form.

For years I have been looking for an inexpensive way to create a flexible skin covering for robots and electronic circuits. I have tried several kinds of casting urethane rubber and silicone rubber. They all have their difficulties and either set up to fast or too slow. They are too thin or they are too thick. They are also very expensive in small quantities. Added to that is the problem that they have a very limited shelf life and usually must be used within six months. Sugru is great, but it is not affordable for making larger structures.

I and many others have tried using the inexpensive silicone caulk that is readily available from hardware stores. It is used to seal roofing and glass windows. It works fine but has the problem that it can only be used by putting it on thinly and waiting a long time for it to cure. It is also hard to work. It must be smoothed immediately while it is very sticky. Otherwise, the surface cures quickly and then forms a gummy film while the inside remains soft and wet. It has a smoothing time of seconds rather than minutes. If you put it on too thick the inside will remain soft and can take several days to finally cure. People have tried all kinds of additives in an attempt to make it cure in a more useful manner. I have found those additives to be unusable for my purposes.

So I wanted to add a catalyst that would help the silicone to cure from the inside out rather than just from the outside in.

As I understand it, 100% silicone caulk works by the moisture in the air initiating the polymerization of the silicone. So it cures from the outside in and as it does, it allows the water vapor to slowly seep inside and eventually cure the unexposed silicone. While it cures, it gives off Acetic acid (vinegar is diluted acetic acid) which is the strong smell you will notice if you use it.

I experimented with quite a few additives to try and introduce some moisture into the uncured silicone. Several of them worked to some degree, but the hands down favorite was also the least expensive.

It turns out that corn starch is highly absorbent and when sitting around in an open box it will absorb moisture from the air. It is an extremely fine powder that diffuses evenly in mixtures. By adding the right amount of corn starch, the sticky silicone is somewhat stiffened and very quickly starts to set up from the inside out. While it still sets up faster on the surface than in the middle, the whole thing will set up in five minutes to 2 hours no matter what the thickness. The actual curing time depends on the temperature, the humidity, the amount of corn starch added, and the speed at which it was mixed.

So that's it. Oogoo is corn starch and clear silicone caulk mixed together and then molded by hand or by forms to create just about anything you can imagine that needs to be adhesive initially and solid yet flexible when cured.


Step 2: Materials

Picture of Materials
Materials to Make Oogoo:

100% clear silicone caulk-the kind that gives off the vinegar smell while it cures. Can be found in any hardware store or Walmart. It cost from $3 to $5 for a 10 oz. tube. The newer silicone caulks that have a different smell such as GE silicone II will not work for this.

Caulking gun for silicone tubes.

Mixing cups

Popsicle sticks

Gorilla instant glue

Gorilla tape

100% Corn Starch

Linseed based oil paints to color oogoo


Materials to embed an etched circuit:

Clear Contact vinyl shelf liner from Walmart or hardware store.

Ferric Chloride etchant

Gorilla white glue

Surface mount LEDs

Magnet wire or conductive thread

Veil shield conductive cloth from http://www.lessemf.com/


Step 3: Mixing Oogoo

Picture of Mixing Oogoo
tapeit.jpg
Mix By Volume
As stated before, Oogoo is simply a mixture of clear silicone caulk and corn starch. It can be mixed anywhere from 5 to 1 to 1 to 2 silicone to corn starch by volume. Up to a point, the more corn starch you add the faster it will set up. I like to mix it in small disposable cups using a Popsicle stick that is wrapped with Gorilla Tape to create a spatula. See pic4. Once it cures the Oogoo peels easily off the tape wrapped stick and the mixing/spreading stick can be reused.

Mix In Small Amounts
A good starting mixture to try out is 1 corn starch to 1 silicone by volume. It is easiest to mix it in small quantities so as to have plenty of time to work it. To see how it works, you could start with 1 tablespoon silicone caulk to 1 tablespoon of corn starch. You can reduce the amount to as little as 1/4 tablespoon corn starch to 1 tablespoon silicone if you want more time to cast it or sculpt it. I rarely mix up more than 3 tablespoons of silicone at a time.

The dry starch and sticky silicone do not want to easily mix. But if you are persistent and keep quickly stirring and mashing the mix, they will eventually merge into a thick paste. The resulting Oogoo is very sticky and will stick to anything that you spread it on. Most things it will stay well glued to. On a few things like some plastics and metals, it will easily peel off after it has cured.

The resulting Oogoo is a nice reflective white but I recommend coloring it so that you can easily see if you have an even mix. See the coloring step.

WARNING: While mixing, Oogoo will give off the strong smell of Acetic acid which can be irritating to the eyes and respiratory system. I strongly recommend that the mixing and forming be done outside or in a VERY WELL VENTILATED room. You should also wear nitrile gloves while mixing as the uncured silicone contains other solvents that might be absorbed by the skin.

One recurrent problem with silicone caulk is that once opened, it will tend to set up in the tube tip. To get a good seal I have had good luck using Gorilla tape wrapped over the tip. See pic4b. If you leave a quarter inch gap between the wrapped tape and the tip you can squeeze out just enough silicone to seal the tip well from air and moisture.


Step 4: Hand Molding

Picture of Hand Molding
handform2.jpg
Pic5 shows the fresh mix mounded up to create a glass stopper. Pic6 shows the final hand molded form.

Oogoo can be hand molded onto or around just about anything. However, you will have to move fast as the fast mix will fairly quickly go from sticky to putty to a clay like material in just a few minutes.

Mix up some Oogoo as quickly as you can and then use the mixing stick as a spatula to spread the Oogoo on whatever you want it to stick to. While it is sticky mound it up to a shape that is roughly what you want the final shape to be. Let it set up until it is barely sticky and then start patting it into the form you want. At some point it will be like clay and can be fine tuned to its final shape.

Fast Mix
A mix of 1 corn starch to 1 silicone caulk will be like a putty in 1 to 2 minutes and can then be hand smoothed. In 3 or 4 minutes it will be like clay and can still be molded but is hard to smooth. So, you only have about 5 to ten minutes of working time with this mix.

Slower Mix
A mix of 1 to 3 or 4 will give you up to thirty minutes working time. A 1 to 5 mix can give you an hour or more working time. Depending on how fast it is mixed, the thickness of the structure, the temperature and the humidity, the slower mixes will turn solid and rubbery in from 5 minutes to an hour.

If while mounding your shape, you run out of Oogoo, don't worry as you can just mix up another batch and add to it while it is curing. A fresh mix will stick really well to Oogoo that is curing or even Oogoo that has cured for several days.


Step 5: Coloring Oogoo

Picture of Coloring Oogoo
I was pleasantly surprised to discover that all it takes to create vibrant colors in Oogoo is very small amounts of linseed based oil paints. Apparently the pigments in oil paints are very fine and dense so a little goes a long way.

About the equivalent of 5 or 6 drops of oil paint per teaspoon of silicone will result in solid colors. I mix the color well with the silicone before adding the corn starch.

While you can leave it white, it is a good idea to add some color to make it easy to see if you have a well mixed batch. Adding color does not appear to significantly effect the hardness or flexibility of the final result.


Step 6: Sanding and Carving Oogoo

Picture of Sanding and Carving Oogoo
While you can cut Oogoo with a knife, its rubbery flexibility makes it difficult to get precise cuts. It is more easily carved or sanded with power tools.

I used a stationary disk sander with 150 grit sandpaper to sand smooth the hand formed stopper in pic8. It sands cleanly but It is slow to sand, so before it cures, you should try to hand form the structure as close as possible to the final desired size. I made the mistake of not putting a mold release such as Vaseline on the glass vial and it was very difficult to remove the stopper after it cured.

Oogoo can also be carved with a Dremel tool and a high speed carbide wheel. Wait at least twenty four hours before carving smaller objects and up to several days for thicker ones. Do not carve until the strong smell of acetic acid is mostly gone when you put it up to your nose. Otherwise you will be shooting very small particles containing irritating acid into the air. Not Healthy. Do this outside with a filter mask or with a good vacuum system.

Step 7: Casting Oogoo

Picture of Casting Oogoo
Casting In Plastic Containers
Just after mixing, Oogoo is very adhesive and will stick to almost anything. It will not remain stuck to some plastics such as PVC, polyethylene and polycarbonate. So any kind of container made out of these plastics can be used as a form or mold. The blister packs used to package many products contains clean smooth forms that can be used as casting forms. Clear polycarbonate cups and dishes can also be used.

Pic9 shows a funnel shape that was made using the inside of a polycarbonate martini glass. The Oogoo ended up about 3/16" thick and is quite flexible. It could be used as a funnel.

Simply smooth on the mix to fill up the form in layers while working out the bubbles. It does not have to be done in one mix. A fresh mix will stick very well to oogoo that is setting up and also to older Oogoo that has fully cured. So layers can be added at any time.

Casting in Gorilla Tape
Oogoo does not stick to Gorilla Tape so the inside or outside of any container or surface covered with the tape can be used as a form. After it cures the Oogoo will peal easily off.


Step 8: Making Tubes, Sheets and Laminations

Picture of Making Tubes, Sheets and Laminations
lamination.jpg
Forming Sheets
It is easy to make sheets of Oogoo. Simply spread out a mix between two layers of clear polyethylene and then roll it with a round object as if you were working dough. See pic10. I like to use polyethylene plastic from gallon freezer bags. If you put down spacers of thin wood or metal you can keep the thickness uniform.

Once flattened, If you just want a single sheet, then wait 4 or 5 minutes and then peel off the top layer of plastic. This will leave a very smooth surface top and bottom.

If you want to work it more, then peel off the top plastic after 2 or 3 minutes while it is still a bit sticky and then form around whatever you want it permanently attached to.

Making Layers
To make layers, make one layer and let it set up until it is fairly stiff and then roll out another layer nearby. When it is set up enough pull of one layer of plastic you can then stick it on top of the first layer. You could embed whatever you want between the two layers such as a tool blade or a printed circuit board. Pic11 shows a three layer lamination.

Making Tubes
Tubes are a bit more tricky and require fast working. Use a plastic tube or wrap Gorilla tape around a dowel to create a form that the Oogoo won't stick to. Make a sheet of Oogoo that is wider than the diameter of the form. As soon as you can, peel the top layer of plastic and wrap the sheet around the form. Make sure there is overlap where the edges meet and quickly smooth out the seam.


Step 9: Make It Glow

Picture of Make It Glow
Oogoo Lighting
Oogoo has many possibilities for lighting fixtures or light ribbons. Pic12 shows a 4" translucent cube that was made by coating an acrylic cube that I had with a thin layer (about 3/16") of translucent Oogoo. It was then lit up using a 1 watt white LED.

The Oogoo can be made translucent by using a 1 corn starch to 3 or 4 clear silicone caulk mix.


Step 10: Making Silicone Paint

Picture of Making Silicone Paint
Pic13 shows the final robot pumpkin head with LEDs all on. I used it to experiment with different mixes of silicone paint.

This is not a new idea, but silicone paint is easily made. Simply add naphtha or mineral spirits (paint thinner) and oil paint to the silicone caulk until you get the consistency of paint you want. The only problem with the paint is that it dries much weaker than silicone caulk alone or Oogoo. It has lower adhesion and lower tear strength. Even so, it is useful for some things.

I like a 1 corn starch to 3 mineral spirits (or Naphtha) to 3 silicone caulk for a translucent white gel-like paint. For a paint that is thinner and closer to an oil paint thickness you can use a 1 cornstarch to 4 mineral spirits to 2 silicone caulk. The more solvent you add, the weaker the final strength and adhesion will be.

You can also use acetone, xylene, or toluene but they all have nasty fumes and take several days to dissipate in thicker applications. The Naphtha has the advantage that it evaporates fast and loses most of its smell overnight.

Solvents that give off less noxious fumes and can be used to thin Oogoo and Oogoo II are turpentine and Citrus Solvent. Their only problem is that they can take several days to evaporate in a thicker cast of silicone rubber. For paint thicknesses they work fine but set up pretty slow.

Step 11: Etching Conductive Cloth for Soft Circuits

Picture of Etching Conductive Cloth for Soft Circuits
etching1.jpg
etching2.jpg
Pic14 shows a ribbon cable made of etched conductive cloth (Veilsheild). LEDs could be glued on it to make a light ribbon. Clean and sharp conductive traces like this are possible using the method described  below.

For the robot pumpkin head circuit I wanted to etch a very simple pattern as I was going to be trying several new techniques to glue and laminate the circuit.

The problem has always been to find an inexpensive, simple way to get a resist that is removable but will etch sharp high resolution conductive traces. I experimented with all kinds of tapes but they were either not waterproof enough or they had so much adhesion they peeled off the conductive coating on the fabric.

I finally tried clear vinyl shelf liner. It is just sticky enough to keep out the ferric chloride etchant, but not so sticky that it wont come off cleanly. the conductive cloth is placed on a piece of shelf liner with its sticky side up. this seals the back side. Another piece of liner is cut with a sharp x-acto knife to remove vinyl wherever the circuit needs to be etched. The conductive cloth is then sandwiched between the two layers of shelf liner. See pic15.

The cut traces are then burnished with a Popsicle stick to make sure the edges are adhered well to the cloth. It is then dipped into ferric chloride etchant for five minutes at room temperature. As soon as it looks well etched, it is removed and immediately submerged in a bucket of water and swished around. Remove it from the water and then rinse it some more to be sure all the etchant in the fibers is removed. the shelf liner can then be slowly peeled off and the cloth left to dry. Pic16 is the final cloth circuit board.

I have been experimenting with etching conductive cloth for several years. For some of the results see here: http://www.instructables.com/id/Conductive-Fabric-Make-Flexible-Circuits-Using-An/


Step 12: Glue The Circuit and Laminate It

Picture of Glue The Circuit and Laminate It
pumpkin3.jpg
helper.jpg
Making Conductive Glue Using Gorilla Wood Glue
To make a flexible pumpkin head Led circuit, a way to glue the components to the cloth circuit board is needed. Gorilla Wood Glue can be easily made conductive and still have good adhesive qualities.

Mix by volume: 3 powdered graphite to 2 Gorilla white glue. The powder is reluctant to mix but keep at it till you have a sticky paste. You can then blob it onto the wires you are gluing to the conductive fabric traces. While you can add a few drops of water to make it easier to work, this will increase somewhat the final resistance of the conductive joint. Let it dry overnight.

This conductive glue has a very low resistance and is good for connecting two conductors that are close to each other. You can obtain powdered graphite from: http://www.elementalscientific.net/

Pic17 shows how the glue joints looked after the led wires were glued to the conductive circuit board. Because the PLCC2 surface mount LEDs do not have enough surface area to directly glue them with conductive glue, I first soldered thin tinned lead wires to them. This gave more surface area to the glued conductive joint. I zigzagged the leads thinking that might increase the flexibility of the final result.

Gorilla Tape Helping Hands Jig
See pic18b for a helping hands jig I used to hold the surface mount LEDs and thin wire while soldering. It is made of Gorilla Tape taped sticky side up on a piece of cardboard. I had previously used blue tac for this, but this works just as well.

Laminating the Pumpkin Head
Pic18 shows the pumpkin head after laminating with orange Oogoo. The Oogoo was cut off to expose the LEDs. Translucent and colored Silicone paint was then used to finish the pumpkin head.

I have been experimenting with conductive glues for a few years. For other ways to make and use conductive glues see here: http://www.instructables.com/id/Make-Conductive-Glue-and-Glue-a-Circuit/


Step 13: The Robot Pumpkin Head Circuit

Picture of The Robot Pumpkin Head Circuit
breadboard.jpg
The LEDs are flashed in sequences using a 08m Picaxe microcontroller. See pic19. The resistance of the conductive glue joints is high enough that no dropping resistors are necessary. In order to keep the leads to a minimum, Charliplexing is used to control the six LEDs individually. This is a simple way to use 3 wires to control 6 LEDs.

I will try an post a video of the flashing pumpkin head LEDs and code when I get more time.

For details on Charliplexing see: http://www.instructables.com/id/Charlieplexing-LEDs--The-theory/

I did not have time to make an embedded control circuit, so it was just breadboarded. See pic20.

Step 14: Comparison of Oogoo and Sugru

Picture of Comparison of Oogoo and Sugru
flashlight.jpg
circuitlam.jpg
Pic21 shows a eyeglass holder made with sugru on one side and Oogoo on the other to hold on the neoprene neck strap.

Pic22 shows a small coin cell flashlight I made on a circuit board and then covered with Sugru.

Pic 23 shows a Picaxe circuit I laminated on the bottom side with Sugru to protect the thin wires on the back and keep it from shorting.

I experimented around with several packets of Sugru to see what it would stick to and to see what it took to mold it to clean shapes.


Advantages of Oogoo:

1- Made from inexpensive and easily obtained materials.

2- Easy to work and mold into forms.

3- Will set up quickly at any thickness.

4- Can be mixed in any color.

5- translucent structures possible for lighting aplications.

6- slightly more flexible than Sugru.


Advantages of Sugru:

1- Much milder fumes, can be easily used indoors.

2- Cures to a harder rubber.

3- Gives more working time.

4- Already mixed.

5- Somewhat easier to smooth.

6- Carves easier than Oogoo.



Step 15: Other Possibilities

Picture of Other Possibilities
casting10.jpg
flex.jpg
Pic24 shows the LED robot pumpkin head mounted on a T-shirt. It can be glued with silicone caulk onto most fabrics and should be able to handle hand washing.

Pic26 shows the flexibility of the final circuit.

Make Conductive Rubber And Robot Skin
See here: http://www.instructables.com/id/Conductive-Rubber-Make-Touch-Sensitive-Robot-Skin/

Make Conductive Rubber And A Transparent Capacitive Stylus For Ipod, Iphone, And Ipad
See here: http://www.instructables.com/id/Make-Conductive-Rubber-Transparent-stylus-iPodiP/

Making Ooglo: Luminescent Silicone Paint
See here: http://www.instructables.com/id/Making-Ooglo-Luminescent-Silicone-Paint/

Halloween Costumes
All manner of masks and appendages can be made using Oogoo. It sticks well to cardboard and paper and almost anything. You can use it to glue almost any part of the costume together and it sets up faster than most glues. Be sure not to create anything where you will have to breathe near freshly formed Oogoo. Let it sit a day or two and use it only after the vinegar smell is gone.

Make Your Own Lego Parts or Interlocking Blocks
All kinds of interlocking building blocks or circuit modules could be built.

Making Prototypes
Electronic cases of different kinds can be quickly hand made with Oogoo. It might even work as a forming material for a 3d printer or rapid prototype machine.

Stained Glass
Colored Oogoo sticks very well to glass and can be used for various stained glass effects.

Woodworking
It should be possible to make hinges using thin flat sheets of Oogoo glued to wood boxes or cabinets. It may also be possible to use it to make flexible joints for furniture.

Casting Metal
Metals that melt at low temperatures can be cast in Oogoo. See pic25 for a ring I cast out of bismuth.

Gluing to Plastics
Near the end of this, I discovered that Oogoo can be glued to many plastics using Gorilla Super Glue. If after it cures it peals off the plastic, try re-gluing it using a thin layer of super glue.

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TiConn1 month ago

Hello,

I am having trouble with the drying process. First off, I mix the cornstarch and caulk in a container until it is fully mixed. I continue to mix it, then I use my hands to start to shape it. At this point, the oogoo is very sticky and the consistency is not as thick as clay. I finish shaping it and it resembles clay and has a matte finish. It does degenerate when I push on it. I let it go for about 2 hours, and it still degenerates! It is not rubber at all! I used a 1:1 ratio. I was thinking one issue might be that I am working in a humid environment. I mix and shape the oogoo outside, but after about 5 minutes outside I take the oogoo inside for it to "harden". PLEASE HELP!!!!

f1dd13r TiConn3 days ago

Are you sure you are using 100% silicone caulk? I tried it with some sealant we had and it wouldn't harden at all but that proved not to be the right caulk. With the 100% silicone there is a really strong acetic acid smell and that has worked every time for me.

I see that you are having some trouble, and I am too. I tried something this morning though. I suggest before putting the Oogoo on the plastic molds, rub them in something that's liquidy and never dries, like vegetable oil. I'm sure that this will work. Just don't wash the oil off until after you take the oogoo out of the mold.
Of course, this only for plastic molds. I'm afraid I can't help with anything else.
Goofpod2 months ago
Goofpod Goofpod2 months ago

Not sure why that post is blank...?

Here ya go:

Has anyone figured out what to add to make oogoo harder, like Sugru? Maybe another additive, or simply the "golden ratio" of cornstarch to silicone etc.? The end product is great, but Sugru seems to be a little tougher, stronger once fully set. Thnx!

Maybe this is of some use?:

'The formulation of sugru contains 30% silicone caulk (polysiloxane) 20-50% talc, and the remaining additives including:methyltris (methylethylketoxime) silane, γ-aminopropyltriethoxysilane, and dioctyltin dilaurate.'

~ https://en.m.wikipedia.org/wiki/Sugru

apple-o3 months ago

Regarding coloring the plastic, the last time I was at Home Depot, I looked in the paint department and could not find any linseed oil based paint.

Can anyone recommend where to find this, either online or at a national chain, and if so, a specific brand or product?

How would food dye, candy dye (which I think is oil-based), standard (ie non-linseed oil-based) oil paint (for example the kind in tubes they sell at an art store), or acrylic paint work in lieu of linseed oil based paint?

I would want a coloring agent that

1. is non-toxic & safe for regular handling, kids, etc. (which is probably why they specify linseed oil based paint?),

2. will not stain things when wet (which I suspect something water-based like food coloring or acrylic paint might do?)

3. is not too hard to find or expensive (a nice to have, the above two requirements are the most important)

Any info appreciated!

I've found that Alkyd (fast drying) oil paint, works very well.

Goofpod apple-o1 month ago

Artist's paints for painting on canvas are linseed oil based. Michael's stores carry them as well as most independent art stores. Just a few drops is all you need.

mxx apple-o1 month ago

apple-o, as far as I know, most oil paints are linseed oil based.

For sealing caulk tubes, I find sticking a large nail in the end of the tube works really well. Cheap, and reuseable, as long as you haven't cut the opening too large.
Hello,
For those that would like a pourable version ...use 1-1-1 parts of
100% silicon caulk (white or clear)
Corn starch
Naptha or paint thinner....Naptha will set faster but costs is a little more.

I use this ratio to create molds to pour my fishing lures...like soft rubber worms..etc....it will stand heat up to 500 degrees.

Mix very well....NO LUMPS.....this ratio will start to set in 40 min...and be fully cured in 4-5 hrs....I let mine set for 24 hrs before i put them in full use.

How does the rubber compare to the putty version's?

f1dd13r1 year ago

I made some yesterday and managed to hang some pot lids up with it.

You can seal the caulk tube by removing the nozzle and laying some cling film/saran wrap over the hole, then screw the nozzle back on again to hold it there. Poke out the stuff stuck in the nozzle if there is any , so it can still be used.

I just seal the cartridge tube with a little of the silicone sealant, screw the nozzle back on, then put it back in the fridge.

holymoses8 days ago

Probably the preparing temperature and moisture are important, gelatinizing the starch could make sense!

Found an old Patent:

http://www.google.com/patents/US4495226

Method for preparing silicone-treated starch

US 4495226 A

A method for treating starch with organosiloxane polymers is described in which the organosiloxane polymer is contacted with starch in an aqueous dispersion at a temperature of from 60° C. to 98° C. for a period of at least 60 seconds. Starch treated by this method can be useful as glue, a binder, a filler, or a coating. Starch treated with aminoalkyl- or epoxyalkyl- substituted polydimethylsiloxane is especially useful as a water repellent sizing for substrates such as paper and textiles.

holymoses9 days ago

I found you here:

http://hackaday.com/2010/10/11/oogoo-a-home-made-s...

and besides the high price of Sugru this is the annoying point:

"but one can’t (yet!) just drop in on any local hardware store to buy a quick fix"

So, good idea to test and probably improve!

:-)

JoelL31 month ago
mxx1 month ago

Wonderful instructable with must-have knowledge for the diy-selfer!

Kirrashi2 months ago

can someone explain why the silicone 2 will not work for this? It seems to be more easily avaliable to me, but I don't quite understand why it's different

DCengineer3 months ago

I am aware that it has been done many times, but I am wondering how well oogoo performs as a cord reinforcement. My old laptop cord has finally reached the end of its extended life (I have already rebuilt it once using super glue, heat shrink, and modable epoxy, and I nearly destroyed it in the process). Instead of waiting for my new-soon-to-be-heavily-used cord to wear out, I intend to reinforce it ahead of time. I have several questions:

1) Will the oogoo stick to both the cord and power brick?

2) The brick will be moved around a lot, will the oogoo wear down significantly over time?

3) I tend to be very fidgety. Can cured oogoo be easily shredded (and make a wonderful mess a the community college)?

4) Will the oogoo become hard enough to actually protect the cord?

mikey77 (author)  DCengineer3 months ago

Oogoo sticks to metal and plastic, but not real strongly. The more surface area it is in contact with the better it will stick. If there are rough surfaces or irregular surfaces that it can wrap around, it will stick better.

When rubbed it does not wear down easily.

It does not shred easily, but it can be sliced by sharp objects.

It will be hard enough to protect well if you can attach it well enough to not slide around.

apple-o3 months ago

On hackaday (see below) one person said they used bleach instead of corn starch.

Does anyone know if this is a good or bad idea?

Other than the normal dangers of working with bleach
(fumes, chemical burns, staining your clothes, etc.)
would this create toxic fumes or result in a more toxic plastic,
or have any different properties that might be useful
(such as more or less flexible, bendable or rigid, etc.)?

Much appreciated...

http://hackaday.com/2010/10/11/oogoo-a-home-made-s...

>> Bob C. says: October 12, 2011 at 1:14 am

>> ...

>> I just made some of this stuff and used regular household bleach

>> instead of corn starch and a few drops of acrylic paint.

>> 2 drops of bleach for every full trigger pull of GE Silicone I,

>> it worked GREAT…

>

> Jerry Carter says:

> August 28, 2013 at 11:04 am

> Thanks for the alternate recipe! Sounds like bleach would

> mix more readily than corn starch as well

Nelly433 months ago
I have made this for a couple of projects. I thank you very much for the instructable. I have been using two plastic spoons and a shallow Tupperware container to mix it in and I really am happy with the re usability/ ease-of-cleanup those items give me. I simply let them dry and in a day or two peel all the silicon bits off and they are ready for the next project.
germeten3 months ago

Do you believe that the cornstarch contributes to the fast curing? Do you know of any other higher temperature tolerant fillers a person might use for say, casting pewter or eutectic alloys?

_GetAxe_3 months ago
Hello there mikey 77.. Im just wondering, if i put lets say about 2 to 1 cornstarch to silicone by volume, will the silicone absorb all the cornstarch? And i want to know if it is heat safe? Thanks for the great idea dude..
Dancedebs3 months ago

hello can this method be used to make large molds for beeswax candles? I ve a ceramic ganesha I'd like to mold

mikey77 (author)  Dancedebs3 months ago

Yes, it works well for molds for beeswax and other materials.

Test the Oogoo on the the object you are casting with a small patch of Oogoo.

See how well it sticks and how easily it peels off.

If it sticks too well to a porous object, you can spray the object with spray lacquer, as a mold release.

Apply the Oogoo, let it set up and then you can cast the beeswax.

MikeyB34 months ago

Do you think adding epoxy to the mix would help it to be more rigid when it cures? It would be cool to be able to vary that based on how much you mix in.

dsnell16 months ago
Is oogoo safe to use with foods? I.e. If you made a spatula or as the lid to a jar similar to the one you made. Also is it safe if a child got its hands on it and put it in their mouth?
mikey77 (author)  dsnell16 months ago

As I have said several times before, Oogoo is not food safe. So, you can add it to the list of things people, and especially children, should not put in their mouth.

If you want food safe silicone, you could try sorta-clear 40 silicone which is available from Smooth-On.

ahecht mikey774 months ago
If I'm using pure silicone aquarium sealant (which says that it is food/pet safe when fully cured) and food-grade corn starch, is there any reason that the final product wouldn't be food safe?
mikey77 (author)  ahecht4 months ago

Most likely, it would be food safe, but the only way to know for sure would be to run some tests.

One test you could try would be to do a test with the minimum of corn starch. Mix a batch of 3 or 4 to 1 of silicone to corn starch by volume. After it has cured, bury it in moist dirt for a week or two. look at it under a microscope for any signs of discoloration or mold. I have done this test with regular silicone caulk and found no evidence of mold after several weeks.

In my experiments most of the corn starch is internally embedded with very little on the surface of the cured Oogoo. You could try boiling the set up Oogoo in boiling water for ten minutes to dissolve any surface corn starch that could feed mold or bacteria.

That said, I would suspect aquarium sealant, if it smells like vinegar while curing, would be quite safe for storage of dry materials like coffee or powdered milk.

Hot liquid foods and moist foods might require further testing.

wolvmarine made it!5 months ago

Oogoo catalyzed by corn starch vs soapy water bath? The latter being the less messy and easier method is now gingerly haning off my laptop as I type. I have been following the oogoo process for awhile now and happen to come across the soap/water bath rendering and decided to make the water immersion version since it a more "pure" rendering. I've taken a few photos and I'll update with the cured form as well.

IMG_20150226_120422.jpgIMG_20150226_115935.jpgIMG_20150226_115844.jpgIMG_20150226_115715.jpgIMG_20150226_115708.jpgIMG_20150226_115302.jpg
Shikamon7 months ago

Hey there! I tried making Oogoo just recently and it worked great but I was wondering about something. Is there a way to make Oogoo bond to surfaces by itself like Sugru could? Also, if I use less corn starch, would that help make the surface more repellent to sweat? I'm planning on making a mouse grip and would love to make this workout! Thanks and great instructable! :D

mikey77 (author)  Shikamon7 months ago

As I mentioned in the instructable, Oogoo does not bond as well to some plastics as Sugru does. You can try putting a thin coating of superglue or a thin coating of pure silicone caulk on the surface. Let it set up overnight and then apply the Oogoo.

If that does not work you can try for a mechanical connection. Use whatever glue will work on your surface to glue fabric or thin plastic mesh onto the surface. Once dry you can add the Oogoo.

I have not had any trouble with sweat on Oogoo. Clean it occasionally with soapy water and it should work fine.

scribbley mikey775 months ago

not sure if this will help but there are mould release agents used in the composites industry which for some reason seem to have the opposite effect on silicon,the only reason I could come up with was that the release agents have some sort of silicon base and those guys spent a lot of money finding ways of getting it to stick to composite moulds.

I think it was called frekote

Shikamon mikey776 months ago

Ok Mikey! I'll try putting some silicone caulk on my mouse then. Should have thought of that before. xD Thanks again and have a happy new year! :D

Ironwave6 months ago
Thanks for this.
It is posibly the second handiest thing I have ever encountered.
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