How to care for plastic resin molds

scraping resin off a mold

How to care for your plastic resin molds

Did you know that a few simple steps will allow you to keep your resin molds in tip top shape for many castings?  Here’s a few suggestions:

1.  After demolding your pieces, remove any resin drips while it is still in the soft cure stage.  It will be much harder to remove the resin later once it has dried hard.


washing resin mold

2.  Wash your mold with a good detergent and warm water.  (Dawn works well.)  I do this after every casting to remove any residue, dust, or excess colorant.  Hint:  If you need to dry your mold, use a soft, lint free cloth.  You don’t want to leave fuzzies that will affect your next casting.

3.  Store your molds either vertically or horizontally, but make sure they’re not twisted.  If they stay in the twisted position for a long time, they may not lie flat again.

4.  Keep them out of direct sunlight and away from heat vents.  The excess heat may cause your molds to warp!

5.  Be careful what you use in your molds.  The plastic is sturdy, but it will scratch.  Use caution when using anything with a point, like a toothpick, pin, nail, etc, because it will scratch the surface.

What else do you do to keep your resin molds like new?


Unpublished Blog Posts of Resin Obsession, LLC © 2013 Resin Obsession, LLC

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I tried using resin my first time awhile back and I guess I messed up on measuring because it never set up. It’s still gooey and extremely tacky. Is there some way to get this out easily? Thank you.


@Kim, you can try putting your molds in the freezer for 10 minutes. Slap the molds on a hard surface. If you are lucky, the resin will pop out.


I use a little bit of acetone when cleaning my molds, let it sit for a minute or two then use a q-tip and gently wipe away the resin. Then i wash them with soapy water and leave them to air dry.
Acetone is also great to clean your tools with, just soak them for a bit and it cleans right up 🙂

Judy Huck

The plastic pyramid mold did not work well for me. I had added some decorative rocks and gems but it seems one of the rocks stuck to the side of the mold and damaged it. I was only able to use it one time. It was difficult to get out so had to put in the freezer.


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