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I’m still very new to resin and just recently have been having trouble with my pieces in silicone molds. When I go to take my cured pieces out of the mold, they’re stuck to the silicone in some spots, and when I finally get the piece out, there is now tears in the silicone and silicone stuck to the cured piece of resin. It’s happened in three different silicone molds I have.
I’m just not sure what I’m doing wrong.. Is it because I didn’t mix correctly or perhaps because the weather is getting colder? I also was wondering if it was because with these pieces, I did multiple layers of resin. I let one layer cure completely and then added another layer on top of that. Maybe I’m not supposed to do that?
Sorry in advance if this question has been answered already. Thank you!
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Hi Lucy,
I’m sorry to hear this is happening to you. Are you using a mold release? What resin are you using?
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Hi, thanks for replying!
I haven’t tried using a mold release and I use Alumilite Clear Cast resin that I bought from Michael’s.
Thank you in advance!
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While I wouldn’t expect that resin to cause a problem, I always recommend using a mold release. It makes demolding easier and prolongs the life of your molds. We have several in our store here:
https://shop.resinobsession.com/collections/tools-and-supplies/mold-release The Petrolease mold release on that page is the one I use on my plastic and silicone molds.
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I just had this same problem with my silicone mold. One of the four castings in the mold got stuck and tore bits of silicone from the mold. How can I remove the silicone bits from the resin casting? Thanks for your help!
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I think I REALLY need a mold release for my silicone molds. What are the differences between Petrolease, Ultra4, and Cast n Craft? Is there one that works best with silicone molds? How long do you need to wait after spraying before you can pour in your resin? Thanks in advance!
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Hi Molly,
The Petrolease mold release is the one I like best. https://shop.resinobsession.com/collections/tools-and-supplies/products/petrolease-non-silicone-food-grade-mold-release . It gives even coverage and can be used if you are making a mold of something will be used for food purposes. It’s an aerosol product, so we can only deliver it to the continental U.S. If it can’t get shipped to you, the Castin’ Craft mold release (non aerosol product) is a good second choice.
Regardless of the mold release you use, it needs to dry for 20 to 30 minutes before pouring resin.
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Hi I have the same problem. I have used the same silicone jewelry molds numerous times. All of a sudden my resin is now sticking to the mold,which is causing tearing in the mold when I pull it off. I use art resin and a UV resin on occasion… not together. Still, some RIP, and then some will easily slide out.
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I also have the same problem. The resin has torn up my alphabet silicone molds. Yesterday i tried rubbing the mold with cooking oil and then when it cured it came out completely cloudy. I also tried a new technique of spraying rubbing alcohol after i poured the resin in, to get rid of the bubbles. Im not sure what caused the cloudiness- the oil or the rubbing alcohol. I read online baby oil might work so i ordered that for my next run. But after seeing how this turned out im not sure if baby oil will work. Will petrolease cause the resin to be cloudy too?
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Hi Kimberly,
No, the Petrolease will not make your castings cloudy. I like to use it by creating a fine mist in the air, then drawing the mold through it. Allow it to dry for at least 20 minutes before pouring resin.
You can find the Petrolease in our store here: https://shop.resinobsession.com/collections/tools-and-supplies/products/petrolease-non-silicone-food-grade-mold-release
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Hi there, I’ve recently encountered the same problem. I’ve been working with resin for a year, and last month I purchased a Bio Epoxy Resin by Change Climate to try out. It seemed to be working fine, then I noticed that my molds would have a whiter appearance to it where the resin had been – less translucent. I thought it could be some residue from the hardener, but when demolding the other day I found that the resin had completely stuck to some of the molds – like it had chemically combined where come into contact…I was so disappointed that these molds are ruined! It seemed like the bio resin sort of chemically broke down the silicone. Which sucks.
Does anyone have any experience with this? With Bio Epoxy Resin? Would love any advice or any sharing of knowledge on why this resin did that, and if others also react in the same way.
Cheers
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Hi Kashia,
Have you seen this article? https://resinobsession.com/resin-frequently-asked-questions/resin-sticks-to-silicone/
It might give you some ideas as to what’s going on.
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Hello. If my silicone mold is torn a little. (Has minimum tear from the resin and mold being stuck together) am I still able to use the mold?
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