If you cast resin into resin molds, you might be wondering if you need a resin mold release. I use one every time — and here’s why:
In case something goes wrong
The plastics and silicones used for resin mold-making are inherently designed not to stick to resin. So if the resin isn’t supposed to stick to them, why use a mold release?
Let me put it into practical terms with this example….
You get in your car, then put on your seatbelt. You drive around town and everything is fine. In fact, you do it day after day and nothing bad happens. Eventually, you think to yourself that you really didn’t need to have the seatbelt on. BUT, one day you are in a bad accident and you NEED that seatbelt. It’s what saves you from serious injury. Using a resin mold release is the same thing. I like to use it for the days that something goes horribly wrong — like your resin doesn’t cure. It’s those times that using a mold release may be the only reason you get the resin out of the mold.
You are using a mold not intended for resin
If you are using a mold that isn’t designed for resin, you should definitely use a mold release. This includes plastic candy molds, candle molds, and other plastic molds you might want to try with resin. Using a mold release is essential if you have any chance of getting them demolded.
It prolongs your mold life
When using molds for resin, they will degrade over time. Continuous twisting can warp a plastic mold while silicone molds get microtears that wear out the mold faster. Using a mold release means you don’t have to pull or twist on the mold as hard, which means your mold will last longer.
What resin mold release do I use?
I prefer our Ultralease mold release. It is specially designed for epoxy resin castings. I love that it applies lightly and evenly over my silicone and plastic molds. Resin castings slip out like butter — I mean buttah.
The unfortunate thing is that we can only ship it to the continental United States. Not our choice — but it’s the law because it’s an aerosol product.
What do you do if you are outside the U.S.?
The Castin’ Craft mold release is a great alternative. It doesn’t create the ‘cloud’ the Petrolease does, but still works quite well.
We also have some other specialty releases in our store.
How do you use resin mold release?
I’m so glad you asked! Here’s how I like to use it in this two-minute video:
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