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DIY Silicone Molds

August 31, by Elaine Robitaille. 19 Comments

Druck

In polymer clay, molds and textures are fabulous tools to have. Some of us (ahem, me) spend a lot of time and money collecting different clay molds to use on our work.

Barbara, from Buntwerkstatt, shares a tutorial for making silicone molds using hardware store silicone and talc.

In the tutorial she comments this should be done outside because the silicone will stink until it’s cured. I also advise doing this with unscented powder rather than baby powder.  This method can use a lot of talcum powder and it smells for ages.

You might want to do a test nub of this to see how long YOUR mix will take to set up. Either do a small glob or a very small mold to test the process. Then you’ll be more confident when you go to mold and cast your final object.

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Comments

  1. Kathy says

    September 1, 2015 at 11:15 am

    Would Cornstarch work?

  2. Elaine Robitaille says

    September 1, 2015 at 10:36 pm

    When I tried this a few years ago, I used a chalk powder from the garage and it worked fine. You could try cornstarch! My only concern is the fact that it’s organic but I imagine it would “cure” in the silicone.

  3. DeBorah Beatty says

    December 23, 2016 at 3:03 pm

    Could you use the sand free grout powder? I use that to make my own gesso.

  4. Elaine Robitaille says

    December 23, 2016 at 11:24 pm

    Give it a shot. I can’t imagine it would react badly – grout powder is inert. You may have to play with the proportions but you would with the talc as well.

  5. Eunkyoung Yu says

    April 10, 2017 at 3:01 pm

    Hi
    Can I use this mold for soap making? or do I need other type of silicone?

  6. Elaine Robitaille says

    April 10, 2017 at 9:59 pm

    I’d say yes, you can use it for soap making but I’d experiment first before doing a full batch, as I would with any new material.

  7. fiona prothero says

    May 16, 2017 at 5:57 pm

    Great. I’m inspired. Thank you

  8. Myrrh says

    June 5, 2017 at 10:24 am

    Once cured do you think it would hold resin?

  9. Elaine Robitaille says

    June 5, 2017 at 9:10 pm

    Give it a shot with a sample one? It’s not my area of expertise but I’d whip up a dummy mold and a teeny bit of resin and try it.

  10. Dee says

    November 23, 2017 at 11:24 am

    Is this food safe?

  11. Elaine Robitaille says

    November 23, 2017 at 4:12 pm

    I would think not but I’m actually not sure!

  12. Elizabeth J Sonier says

    April 8, 2018 at 12:17 am

    Can the mold be put into the oven once it’s cured?

  13. Elaine Robitaille says

    April 8, 2018 at 9:36 pm

    Hi Elizabeth! I haven’t tried but I would make a dummy blob mold to test first before I did that.

  14. Salman says

    November 1, 2018 at 7:29 pm

    Hi. can i use potasium cabonate inset of powder

  15. Elaine Robitaille says

    November 3, 2018 at 12:13 am

    You could try? Potassium carbonate is less easy to find where I am than talc powder. I’d probably try something like corn starch if I were looking for a substitute.

  16. Lori says

    February 18, 2019 at 2:23 pm

    Hi Elaine – do you know if the molds eventually shrink-up or noticeably shrivel? Thank you!

  17. Elaine Robitaille says

    February 20, 2019 at 5:27 pm

    I haven’t noticed any change in the ones I’ve made with a version of this. They’re about two years old and not heavily used. I did immediately have some dry / didn’t mix great areas where I picked bits of the mold off but no change later.

  18. Malie Beukes says

    March 26, 2019 at 5:03 am

    What is the best way to make a mold of a succulent?

  19. Elaine Robitaille says

    March 26, 2019 at 6:05 pm

    That’s a good question. Anything with over hang you’ll want a really super flexible silicone mold. So you’ll need to do some experimenting to get the right texture. If you’re casting a live succulent (rather than an inanimate object) it may be a challenge!

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