Episode 26 how to make a silicone mold in your kitchen on the cheap!

How to make a silicone mold in your kitchen on the cheap! Also how to become a play-dough hero for your kid… The mixture ratio is: 50% Silicone, 50% cornstarch, and mineral spirits to thin. Thats it! The mixture will set up in 5-15 min and cure in 24hours

How to make a silicone mold in your kitchen on the cheap! Also how to become a play-dough hero for your kid…

The mixture ratio is: 50% Silicone, 50% cornstarch, and mineral spirits to thin. Thats it! The mixture will set up in 5-15 min and cure in 24hours

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15 Responses to “Episode 26 how to make a silicone mold in your kitchen on the cheap!”

  1. Jay Adan January 13, 2011 at 6:41 am #

    So does the cornstarch just add volume to the mold or does it have another purpose?

  2. admin January 13, 2011 at 6:51 am #

    It is not for volume corn starch absorbs water and water makes the silicone set up. So the corn starch makes the silicone set up in 5-10 minutes vs 8hours. The more corn starch the faster it sets up….

  3. Jay Adan January 13, 2011 at 7:07 am #

    Oooh.. okay. That makes sense.

    I’ve actually never tried this method of mold making before. I know that people do it but I wasn’t sure about how you went about making the caulk flow properly to get a decent mold with it. I didn’t realize that it could be thinned like that (and I definitely didn’t know about adding cornstarch).

    A very useful video!

  4. Daniel January 17, 2011 at 2:34 am #

    Great tutorial!
    Is it possible to cast metal with that mold?

    Tin in particular.

  5. admin January 17, 2011 at 7:26 am #

    I am not sure about that. I was debating trying some pewter (which has a similar melting point) but never got around to it. Silicone should handle around 300F but given all the additives I am not 100% sure how much heat it can take. So without beating around the bush too much I would say try it out VERY CAUTIOUSLY! Do it outside, well ventilated, wear safety glasses etc etc…..

  6. Jason January 28, 2011 at 10:19 am #

    Great video and I sure could use some hero points at the playdough table. Very Cool.

  7. Mark January 30, 2011 at 7:48 pm #

    I wonder is it possible to cast plastic in the mold. Other than that great tutorial.

  8. admin January 30, 2011 at 8:28 pm #

    Yes absolutely! Just make sure that the plastic when it sets does no heat up too much. I am thinking the mold can take 300 degrees or so but not much more

  9. J_M March 1, 2011 at 2:38 pm #

    Nice job – you’re lucky though, my daughter woulda busted me for using the wrong color playdoh.

    I thought I’d ask/mention – I have made similar molds for plaster and instead of petroleum jelly I used vegatable oil cooking spray (Pam) . Any thoughts?

  10. admin March 1, 2011 at 2:52 pm #

    Spray is fine. basically if it does not stick then you are doing good. I would have used it but I was out of the stuff.

  11. Bob C. March 12, 2011 at 9:04 am #

    Excellent video…..

    I discovered your show with my Roku box and have been a fan ever since!

    I saw a writeup about this technique and ran out and bought a tube of silicone caulking to try with with Plaster of Paris. Not done it yet so this was great timing too. Thanks!

  12. lexie March 19, 2011 at 9:28 pm #

    Dude! sweet vid. been lookin for ways to make silicone. so sick of buying the kits in the store, 10 bucks for 6 oz. of silicone.. usless.

    thankks man!

  13. admin March 19, 2011 at 9:56 pm #

    Glad you like it! I haven’t tried yet but I have been told that if you use glycerine from the drugstore for a thinner it won’t shrink and less stink too! But I haven’t tried it myself so if you try it keep that in mind…

  14. Chris B July 25, 2011 at 7:18 pm #

    How well does this mold do with making plastic forms from the molds? Like making custom toy parts, like plastic heads or props?

  15. Chris B July 25, 2011 at 7:19 pm #

    Forget I said anything, found a similar comment to mine.

    Great video, really helpful.

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