I get lots of questions about using molds, not designed for resin, including casting resin in a soap mold. Sometimes non-traditional molds work, sometimes they don’t. In cleaning up my studio this week, I found a plastic soap mold. It was at that point that I thought to myself, “How a big a disaster can casting resin in this be?”
Oh, you won’t be disappointed.
Note: My resin was a bit cold in the day I mixed it. The two parts didn’t want to blend and I had to mix it more forcefully than normal. This introduced more bubbles. It reminded me to make sure my resin is warm before mixing to minimize bubbles in the resin.
I also decided not to add anything to this resin. I wanted to be sure that if this didn’t work, the resin was the only factor. I didn’t want the results to be clouded by pigments used, inclusions placed, etc.
Before pouring the resin into the mold, I sprayed it with a couple of light layers of the Petrolease non silicone mold release. This is my go-to mold release when I anticipate difficult demolding situations. I used it when I cast resin into a gelatin mold and I’m convinced it was the magic bullet to help me get out those castings.
While you see 3 ounces as the capacity for this mold, I only poured in an ounce and a half of resin. Why? First, this mold would produce a much deeper casting that I would ever want to use as a resin embellishment. Second, I wanted to make demolding difficult. If it’s too easy, I won’t have learned much.
Once I finished the pour and removed the bubbles with a heat gun, I covered it with a dome and let it cure for 24 hours before demolding.
And here is my finished casting. While the resin cured fine, I was unable to demold it from the plastic soap mold. In fact, most of the star is adhered to the resin. I was not able to get it off.
What have you cast resin into that you were unable to demold?
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