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I have to 100% agree with Michael on the Glad Wrap for a good mold release.
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I agree that plastic wrap releases the composite better, but how do you get the Glad wrap to stick to the foam? When I tried to, it didn't want to stay put while I was placing the next piece. for the foil I just spray a small amount of general purpose spray adhesive on the foil then place it over the plug.
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For me the aluminum foil sticks to the composite and does not want to come back off easily.
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I don't mind too much if the foil doesn't all come off, since it's on the inside where no one will see it.