Foamcore is a new approach I had not heard before. The high humidity in my area might cause the paper layer to let go over time. I used sheet foam because I know it will work for at least 25 years and after that I don't care any more.
Release paper is a slippery paper used on the back of foam-tape and vinyl films. Butcher paper is the closest normal thing. One side is coated and the other is usually not. If the contact glue is fairly dry, regular Kraft paper should work fine too.
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