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Reusable casting mold? Answered

I’ve had the idea to sculpt a mold from EPS foam to use as a reusable casting mold. I’ve searched the internet looking for anyone else using this technique and haven’t been able to find anything. I’m on my first paper mache project since taking this class and I’ve decided to give my idea a try for an entry into the current paper contest. After sculpting my mold, I applied Vasoline to it to act as a release agent. My project is currently in the drying stage and I’m happy to say that I think my idea is actually going to work out beautifully because it appears that it will actually release. My question is are you aware of anyone else out there making reusable foam casting molds for paper mache?