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Tape will probably work fine, but what would a coat of wax before taping hurt.

That should work fine. How are you planning on finishing the inside surface?

I've only used it with relatively thin layups of epoxy/glass, polyester/glass, and on the epoxy/paper micarta that I make, so heat has not been an issue. I'ts a bit scary the first time you rely on...

Wax is commonly used as a mold release for epoxy parts. Dedicated waxes such as Part All are used but I'm told and believe that Johnson's or any furniture or car wax will work fine. Incidentally...