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Topic: DIY Silicone Mold with Cornstarch - Questions  (Read 1914 times)
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« on: September 09, 2013 06:06:33 PM »

Has anyone ever tried this?? I bought silicone, corn starch and baby oil today to make some molds.  But the molds don't seem as "siliconey" or bouncy as they do in the tutorial videos I watched on youtube.  And of course in those videos they don't say the amount to use of either ingredient, maybe my portions are off.  But it feels more like a dry crumbly clay, so I added more silicone and then it was too sticky.  If anyone has tips or tricks, pleassssse let me know! 

Also included: a pic of the ingredients I bought, and a couple molds i'm working on.


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« Reply #1 on: September 16, 2013 12:10:18 PM »

I've never tried so afraid I have no tips Sad.

I wonder if you should try the Jewelry boards or maybe the Poly Clay boards? Members there may have tried this technique.

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« Reply #2 on: September 19, 2013 06:05:36 AM »

Is there a special reason you don't want to use "real" silicone molding material?

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« Reply #3 on: January 15, 2014 02:59:13 PM »

I know that this is a lat reply, but I found it looking up things on silicone molds.

As to what went wrong,  I did notice that the tube of silicone also says acrylic and the tutorials that I found all say use 100% silicone, or it won't work.

I have used RTV silicone to make molds and have some silicone to try for this method. 

As to why they want to use caulking silicone, I know that for me I don't make many molds at a time and so the cost verses shelf life becomes an issue.  But then I do all kinds of different projects and have way too many supplies for all kinds of things.  But with building a house I usually have silicone on  hand. 
You can also use a couple of drops of glycerin to get the silicone to cure.  Which is what the corn starch is doing. 
Adding moisture, the acetic acid (vinegar) smell is the moisture curing the silicone. 

I have also heard that baking soda works as it does something to neutralize the vinegar and is supposed to work but I have not used it.

Hope this helps others.  Cheesy   
« Reply #4 on: January 23, 2014 07:20:43 PM »

I did it the other day but with different ingredients. First, I did use 100% silicone type 1. That's windows and doors, not kitchen and bath.

I added five drops of glycerin and a squirt of acrylic paint, then stirred to blend well.

I'm not sure how great this stuff is. It's VERY hard to brush on, if that's what you're doing. The best thing would be to press shapes into a bowl of it, like you seemed to. It also sets very quickly, maybe too quickly to work well with.
« Reply #5 on: February 22, 2014 08:29:39 AM »

What are you going to cast inside the molds?
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