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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.


Step 1: 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.


<p>Is this Oogoo UV stable? I'm want to repair my van's deteriorating window seal which will be in the sun and weather.</p>
<p>I don't know about this &quot;Oogoo&quot; but for my old car I used a clear acrylic sealant. It works perfectly and sets clear and flexible..better than silicone. Cost about &pound;10 a tube. Make sure it's the &quot;outdoor&quot; variety otherwise it becomes soluble in water.</p>
<p>I'd suggest comparing silicone compounds and finding one that brands itself as &quot;UV resistant&quot; or &quot;won't crack or fade in sunlight&quot; etc.</p>
<p>J great stuff J just wondering if this stuff<br>is food safe?</p><p>The dentist wanted 120 yoyos for a new set<br>of bruxism guard (night grinding) so I<br>mould my self a set from alginate and cast one from plaster and used sugru to<br>mould which worked very nicely probably better then the first ones I got from<br>the dentist.</p><p>However I learnt that these are not food<br>safe thus I&rsquo;m looking for another material to use.</p><p>It be great if this stuff would work if not<br>can you recommend a material that is?</p>
<p>Probably too late to be of much use but if you rename this &quot;sports mouth guard&quot; they are under $10 at sporting good stores. Basically the same thing. No medical proffesional involved.</p>
<p>There is a one component food-safe version of silicone caulk. It is still based on the water-curing, acetate-releasing mechanism which this project is using.</p>
<p>and that is?</p>
<p>Oogoo is awesome, but if you make it with the regular clear hardware store silicone it is extremely NOT FOOD-SAFE, don't put it in your mouth. You can buy two-part food-safe silicone mold making material, that might work for what you are describing. (Do your homework on that, I'm just suggesting it as a possibility.) When trying to find this sort of information, the first thing you want to check is the msds (safety data sheet (SDS), material safety data sheet (MSDS), product safety data sheet (PSDS) etc.) It's what the hospital uses to figure out how to treat people who put things in their mouths...</p>
<p><a href="http://www.msdssearchengine.com" rel="nofollow">http://www.msdssearchengine.com</a></p>
Will it stick to glass, I want to make a mold of a glass but don't want it to stick and ruin the cup.
<p>Amazing I seen your proprietary video . At least I think it was yours . With the little red box ? This opens a whole new world for people with Ideas . If I had only known years ago . There were soo many project that got stopped or rerouted . For lack or the abilities that something like this enables . Save money by making your own parts the list goes on . God Bless </p>
<p>Once the caulk-type tubes of silicone are opened, they will cure internally and become useless in a short time. If you have a food-saver type vacuum sealer, the tube can be sealed inside and will last much much longer. Even the low priced hand pump version will increase the shelf life of the unused silicone. The gallon size bags are difficult to find locally, but I checked Amazon and they are available there.</p><p>It's also possible (but not tested) that any unused oogoo left over could be saved in a vacuum bag.</p><p>If you use the hand pump vacuum bags, add a piece of adhesive tape on the vacuum flap of the bag to ensure it doesn't accidentally release and let air inside.<br></p>
<p>Can I use corn flour instead of corn starch?</p>
<p>Sure you can. Will it work? Maybe. Try it out and let us know. Mikey77 did a lot of research which probably included flour and decided cornstarch is best. Personally I'll stick to cornstarch but I would experiment with flour if I was in a hurry and I ran out of cornstarch.</p>
To be fair, it seems the brand he mentions in the article has been discontinued (at least that's what I was told by two hardware stores) GE seems to just be making the II and Supreme line. He only says 100% silicone and that it has be the type that smells a certain way and is clear. They have sealed tips in the store so you can't smell them. It just makes finding the ingredients take a bit of research. I went ahead and bought two to try because I'm still not sure which will work. FYI for those searching, some online stores seem to categorize it under Sealants and not Caulks. I hope anyone else who is still making Oogoo can comment with what specific products they use.
<p>Walmart still sells the right stuff. You don't have to smell it to ensure it's the correct product. Look on the label and you'll see it has a &quot;warning&quot; that says acetic acid is released during cure. Acetic acid is vinegar. The wrong silicone has a similar warning, but the release chemical has a longer name I've forgotten.</p>
<p>corn flour will work as its just the name used for corn starch in other countries and also to the people asking any brand of silicone will work just look for it to say 100%silicone and clear on the label ones that are not clear have a colouring agent and are considered caulk and not silicone as well the smell comes with the clear part as the colored ones dont have the smell if you are here wanting more info try a quick google of oogoo they even have an info card that pops up for it now since this instrucable basically started a crafting revolution.</p>
<p>Corn flour (as found in the US) is <em>NOT </em>the same as corn starch, and has very different properties. Corn flour is basically whole corn, finely ground (vs cornmeal, which is coarsely ground). Corn starch is derived only from the endosperm of a corn kernel, and has different properties -- primarily due to the higher concentration of starches (as the name suggests). The flour contains the gluten as well as the starch, whereas corn starch has been refined and separated from the other components of the corn.<br><br>That all said, since corn flour does <em>contain </em>starch, it may still get the job done in a pinch... but results may vary :)</p>
<p>I got mine at the Dollar General store. I got a tube just a couple of weeks ago - . It was either $3 or $3.50 for the tube.</p>
Has anyone tried plasticising gelatin with PEG, corn syrup &amp; vodka?<br> It would seem to have similar properties, although probably softer.<br> Using 100% silicone sink edge sealer, baby powder &amp; mineral oil seems to work well too!<br> Looking up plasticising in chemistry! (See! Those classes we took in high school ARE useful!)<br> Anyone have a recipe for the gelatin recipe to maximize plasticization?<br> Great stuff!!! Time to crack that old chemistry book?
This is a great tutorial. Love learnibg new DIYs.. Cannot at this time, but, will consider upgrading to &quot;premier&quot; to learn more of what you do. Thank you for this post.
<p>HELP: <br>Can someone in Australia provide the Brand Names of the Caulk used please, there are so many to choose from.</p>
<p>Silicone is either neutral cure or acetic cure (it will say on the packaging) - acetic cure is what you want and should be available in several brands and in clear, white or black (maybe more colours too)</p>
<p>Mark</p><p>I bought Parfix Window &amp; Glass (Clear) from Bunnings. I tried a Selleys white, but it has a different composition and doesn't set hard, more like rubber. From what I read, it seems any clear silicone should work. This one had a definite scent of acetic acid when opened &amp; it was the cheapest brand on the shelf :-) Seems to have worked.</p>
<p>help us out here...what brand of silicone DOES work?</p><p>Exactly what product did you buy to produce and prove out this instructable?... I can't afford to buy, open, sniff-test and throw away a $10 buck product based upon speculation and vague recommendations. I do, however applaud your time and effort in producing this instructable.</p><p>Chas</p>
<p>You can often tell from the warnings and directions on the tube. Most silicones will say something like &quot;use in well ventilated area&quot;, &quot;produces strong odor&quot;, &quot;May cause irritation&quot;</p>
<p>@<a href="http://www.instructables.com/member/hesynergy" rel="nofollow">hesynergy</a> Vague recommendations? Harsh! Did you by any chance check how many views this Instructable has had since it was posted 6 years ago. Or have you googled Oogoo? This Instructable is an institution that kicked off an entire craft revolution. Guess how vague the rest of us found it.</p>
<p>I just mixed up a batch with GE Supreme 100% Silicone, and it worked beautifully.</p>
<p>mikey77 is my hero. How many people create their own subculture, craft and construction technique all in one Instructable. </p>
<p>Cheers guys :)</p>
<p>Lots of cool applications possible. Thanks for posting such a useful Instructable!</p>
<p>Just FYI there are TWO types of Silicone I - clear and white. (I'm not referring to Silicone II which is also white.). I've found the white Silicone I to be far less effective than the clear version.</p>
<p>Curious, has anyone tried this with baby powder?<br>In the wiki description, sugru is made with talc.<br>While corn starch is a better choice for baby bottoms, might the mineral talc be a good choice of this? Experimenting soon.</p>
<p>Most baby powder nowadays *is* corn starch. Mineral talc was found to be dangerous to babies. So the only difference is price and scent. Usually the foodstuff version is cheaper.</p>
<p>Most baby powder nowadays *is* corn starch. Mineral talc was found to be dangerous to babies. So the only difference is price and scent. Usually the foodstuff version is cheaper.</p>
<p>I have a wooden object that I want to duplicate in a different material .. possibly HDPE. can I use saran warp to keep the Oogoo from sticking to the wood so that I can make a mould? </p>
Sugru SHELVING brackets hold weight; I'm wondering if anyone has experience with Oogoo to hold a SHELF?
<p>Hey, does anybody know if I could remove this? Real sugru apparently comes off if you need it to, and I'm planning to attach some sugroo/oogroo to my locker, but it can't be permanent. Does anybody know?</p>
<p>i do not know. but try this on a piece of metal then try different ways of taking it off.</p><p>For hot-melt-glue i use rubbing alcohol (RA) and tweezers. i close the tweezers then dip the point in the RA, then press the tip where the glue meets the metal. the RA then flows between the glue and the metal, separating the two.</p>
<p>will this work for casting aluminium? if no, could it stand lead?</p>
<p>use the lost wax method. <a href="https://en.wikipedia.org/wiki/Lost-wax_casting" rel="nofollow"> https://en.wikipedia.org/wiki/Lost-wax_casting</a></p><p><a href="http://www.onlinemetals.com/meltpt.cfm" rel="nofollow">http://www.onlinemetals.com/meltpt.cfm</a></p>
<p>Dear Mikey77 and all of the helpful commenters here, thank you! This stuff is the bomb! My husband and I have been using it for 4+ years to make relief sculpture molds for our costumes. Over that time we've refined the method specifically for this purpose. Many artists ask us how we do it , so we just made a pdf booklet called &quot;Oogoo for artists&quot;. Check it out here</p><p><a href="http://organicarmorarts.com/product/oogoo-for-artists-book/" rel="nofollow">http://organicarmorarts.com/product/oogoo-for-arti...</a></p>
<p>I cannot express how amazingly wonderful this is without falling back on expletives. So just let me say from the bottom of my impoverished sculptor's heart, Thank You!</p>
<p>I found out that Zippo lighter fluid is also quite a good thinner for Oogoo, it cures at almost the same speed and I can't find any difference in cured texture. Granted, I didn't use a huge amount, just enough to make it easy to mix and spread. </p>
<p>When this cures, is it very flexible, or does it get rigid?</p>
<p>I wonder how long will it last or if it rots over time, maybe attract ants, roaches or other bugs?</p>
<p>Nope, it does not attract them. Made mine around one year ago, still the same like when it was made. The only thing is that it does not feel powdery anymore, since I use 1 to 1 ratio.</p>
<p>I put the silicone and the starch in a zip lock bag and stir it by kneading the bag until it begins to release from the bag. I can then handle it without it sticking to my hands. Time is short at this point, so I have my project set up already.</p>
it works and its a lot cheaper but it is messier and has some things it cant do but it feels real nice when its dry
it's actually works but it can't quite do all the things sugru can but its a hole lot cheaper!!!

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