Resin sticks to silicone – Why does my resin stick to silicone?

why resin sticks to siliconeUsing resin in a silicone mold is a fun way to make resin crafts and jewelry.

Until it isn’t.

Sometimes resin sticks to silicone and will not release.

Why does resin stick to silicone?

Here’s how this can happen:

 

Your silicone mold is at the end of its useful life.

Unfortunately, silicone molds don’t last forever. They will dry out, get brittle and tear over continual use.

 

You didn’t use a mold release.

Mold release helps resin castings pop out easily and prolongs the life of your mold.

 

Resin that is under-mixed can stick to the mold.

Be sure to scrape your mixing utensil and sides of your mixing cup several times to make sure all resin is thoroughly mixed before pouring into the mold.

 

You are using a torch to remove bubbles.

This can melt the mold and cause it to stick in places. Use a heat gun instead.

 

You are using molds that aren’t really silicone.

Non-silicone molds can have problems with resin sticking. Specifically, polyurethane molds can have problems releasing resin castings.

 

Your resin is too hot.

While resin generates heat when mixed with hardener, too much heat can melt the mold, causing the resin to stick.

 

Your silicone mold isn’t fully cured.

If you have spots of uncured silicone, the resin will stick in those places and tear the mold when demolding. This most commonly happens with tin cure silicone molds.

 

So, what should you do if you find your resin sticks to silicone?

 

Use a mold release. A couple light layers of a mold release will help.

Make sure your resin doesn’t get too hot. Here are the reasons why your resin can get too hot.

Use a heat gun to go over your resin to remove bubbles instead of a torch.

Make sure to thoroughly mix your resin and hardener together. Here’s how to mix resin in five easy steps.

 

Need silicone molds for a resin project? You can buy quality silicone molds in the Resin Obsession store.

 

Unpublished Blog Posts of Resin Obsession, LLC © 2020 Resin Obsession, LLC

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9 Comments

Tom Rowland

Hi. Is there a U.K. outlet for you products?
I ask because its to far to ship stuff like resin across the pond.
if you don’t can you recommend a make that I can get in the U.K.

Reply
Katherine Swift

Hi Tom, I’m afraid we don’t have a retailer for the Resin Obsession resins in the U.K., but we can ship you many of our other products.

Reply
Alice Ryan

Thanks, Katherine! I haven’t encountered any of these problems but now I know how to avoid them. You always have the best tips!

Reply
Darian Tiner

Does anyone know how to get the silicone particles off of resin? My mold got stuck and ripped but I would like to try to salvage my project. Help :(((

Reply
clair

Katherine, I did a large pour of 20 small molds. The resin was old I now believe? It never really hardened and its 72 hours now. Still dripping and sticky at best. I have resigned myself to “letting go”, but, not sure how to get all this sticky, half cured resin out of all the molds without ruining the silicone molds. Please advise. Sticky in NY. 😉

Reply

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