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Picture of World's easiest silicone mold.
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Yep. That's right. I am about to change your mold-making technique forever. This simple way of silicone mold-making will have you wanting to make casts of all your trinkets and toys.

You will need:
  • water
  • blue dish-soap (any brand seems to work)
  • 100% Silicone (do not buy quick set silicone, you need 100% silicone)
  • bowl
  • caulking gun
  • something you want to make a mold of.
  • scissors/knife
  • masking tape - to patch holes in your positive, if necessary.
 
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Step 1: Make your catalyzing solution.

Picture of Make your catalyzing solution.
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By mixing a high-concentration of dish soap with water in a bowl, one is actually making a catalytic bath for your silicone. The glycerine in the dish soap accelerates the cure process for of your 100% pure silicone.

This is by no means an exact science, I use blue dish soap because it allows me to see how much I have added to a water bath, I approximate that I used 4 oz. of soap in 64 oz. of water.

Step 2: Catalyzing the silicone.

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Cut off the tip of the silicone caulk tube, and set it in the caulking gun. Unload enough silicone to surround the desired object, into the bath.

I use the whole tube usually.

Step 3: Preparing the silicone.

Picture of Preparing the silicone.
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While keeping your hand submerged in the dish-soap catalyzing bath, gently clump the string of silicone together. Form it into a ball, and slowly massage it. Fold it, stretch it out, and work it very much like one would knead dough.

When it begins to become a bit less malleable, and stiffen, it is time to sink your positive into your material. In this case, Mike helped me, and we used his dinosaur, Jesus. (hay-zoos)
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BMm11 month ago

im a girl and i just want to ask if is it safe to make something penetrative (if you know what i mean) out of that 100% silicone?

Hitlist BMm116 hours ago

go for it if you don't have any silicone allergies. Need a model? LOL

audreyobscura (author)  BMm11 month ago

Hey there - i feel like this is the question i have been waiting for since I published this Instructable. I'm pretty sure that this 100% silicone off-gasses acetic acid as it cures - it would just need to be neutralized before....well. have fun!

thank you for the reply, one more thing. how can I nutralized it?

audreyobscura (author)  BMm11 month ago

http://www.smooth-on.com/Silicone-Rubber-an/c2_1115/index.html

audreyobscura (author)  BMm11 month ago

Maybe a baking soda bath? But this isn't medical grade tested - I would pursue further education about materials that may not irritate your skin. Or do some patch testing on your wrist of a neutralized cured silicone, at the very least.

85roccoyesterday

I've messed around with silicone caulk a bit myself and if I understand the chemistry correctly, silicone caulk cures in the presence of moisture, normally it's atmospheric moisture that cures the silicone from the outside inward but anything you add to silicone that can carry moisture into the silicone will make it cure. I've used corn starch for this but anything that retains moisture will do, a small amount kneaded into the silicone will cause it to cure en mass the same way it does with this soap and water trick.

shep62yesterday

Hi, When I was working in the pharmaceutical industry one of the materials we were handling was proteletic enzyme, this was used in a product that was designed to remove dead tissue around wounds which it did well but we had the problem of it digesting our top layer of skin even with all manner of gloves. Then we had a visit from a rep selling a special barrier cream. He said it would act as a barrier for most things, his demostration was to apply this barrier cream onto his bare hands and then pour Sulphuric acid over them! This was concentrated acid provided by our labs. The demo worked with no evidence of any acid burn to his skin. We purchased this barrier cream by the bucket load and never had any problem with loosing our skin to the enzymes ever again. Sorry about the long amble but there are barrier creames available for many differnet requirements. No gloves and the silicone would lift completely from the cream on the hands when washing hands after work.

MeganC213 days ago
jcurtacci13 days ago
so the silicone will not hurt the paint of the item?
just sayin20 days ago
Can you use this for chocolate or liquid sugar? You know.....to make the chocolate ,etc have a shape
rbloom2 made it!1 month ago

Thank you so much for this. I had ordered a prop that used the same gem featured in my pictures and it was a mess. I am sure that with your technique I will be able to create something much better. Thank you again! Also love that Jesus clone he's gorgeous! (Or she, is that frog DNA?)

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audreyobscura (author)  rbloom225 days ago

Thats fantastic! I am going to give you some pro-membership for folliwng this Instructable, and using the "I Made It!" Button.

Cheers!

Audrey

judy7264925 days ago
Can you use it on a horizontal surface? I have a pattern on my fireplace I'd love to make a copy of.
audreyobscura (author)  judy7264925 days ago

I learned this technique when I was trying to replicate a motif on a tile in my old apartment - so yes! you can! just figure out a way to get the silicone to stay horizontal, Gaff tape worked ok.

I see you were able to cast the entire dinosaur. How did you do this if the mold was only for half of the dinosaur? Great tutorial!

audreyobscura (author)  mckinley_freeman25 days ago

I actually missed the whole back part of the dino - it was only a one part mold. You could make a two-part mold using this technique though.

squirejoe225 days ago

Instead of dish soap, why not just use pure Glycerin. You should be able to find it in any Drug Store?

brown6828 days ago

i advice you not to use on skin or (especially) anything penetrative, i"m an artist and did many casts out of body parts which in such case i used alginate which is extremely safe and the results are super fine detailed.

BMm11 month ago

I tried to handle it and even putt some small amount on my arm while it is wet, nothing happened. but Ill tr to look for some food grade silicon I think that's much safer :)

CarolineK21 month ago

Can you used water based clay for making the original for this? If so, will it need a release and should it be wet or dry when making the mold?

IamTheMomo1 month ago

Can it be extruded? I have some small decorative glass bottles that I like to keep vanilla and other extracts I make in, and I can't find corks to fit well. I'd like to extrude a cylinder that would fit in my bottles, then top them with something larger, such as a button or glass marble.

BMm11 month ago

how about putting something hard inside it?

kelli19631 month ago

it-notwanti=to-harden

timevortex1 month ago

how would/could you cast the whole figure at once?

Cannot wait to do this!

USE RUBBER GLOVES - THE SKIN ON MY HANDS PEALED WHEN I DID THIS THE FIRST TIME - NOT FUN!! COVER THE GLOVES IN THE MOLD RELEASE.....

i dont think that is a normal occurrence maybe get it checked out. depending on the kind of silicon you used it could have dried to youre hands and that is what you saw

The acetic acid in the silicone is burning your hands as it cures. Wear gloves as I heard that your skin absorbs up to %20 of what it touches.

amvancourt1 month ago
I've always used Oderless Mineral Spirits and/or WD-40 to clean hands of residue. Bonus tip: Do not smoke.

thanks! And that's always a good tip! haha

I need a exact mold of my hand. any suggestions ?

Try alginate! this video might help: https://www.youtube.com/watch?v=O3Ow2FAWvKI

soooo...i made a mold just now, it's currently curing, and the silicone was NOT fun to get off my hands! Just a warning for those who have never used it. Any tips on how to get off the silicone?

Not sure of any easy ways of removing it, maybe try acetone.. Gloves might be a good investment :P

izzyev2 months ago

soapy water is to silicone as flour is to pizza dough.

Where did you buy your l.e.d.s and your resin? How long did the l.e.ds last?

So, if this mold is made from pure silicon, does that mean it's food safe? Can it go in the oven and freezer?
paqrat3 years ago
This is way cool. Have you tried it with the white silicone caulk?
I have. It... didn't end well. The pigment in it felt like it was burning my hands after I started pulling it out of the soapy water. I'd stick to using the clear.
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