[Katherine Swift]

This tech service request came through email from Rona:

Cured epoxy resin is sticking to silicone molds, even when using castin craft mold release.

[Katherine Swift]

Heres a few of my random thoughts about things to try differently:

Sometimes if there is sulfur in the original model for the silicone, it can cause problems with curing (even if the silicone looks cured).

Are you sure the molds are silicone? I haven’t had a problem with silicone molds sticking to resin, but polyurethane molds, yes.

Here are two mold release we sell in our store. Both work very well for silicone molds:

https://shop.resinobsession.com/collections/tools-and-supplies/products/petrolease-non-silicone-food-grade-mold-release

https://shop.resinobsession.com/collections/tools-and-supplies/products/ultra-4-polyester-parfilm-paintable-mold-release-12-oz

Are your molds old? Unfortunately, they don’t last forever. It may be that they are starting to breakdown.

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