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Reporting results: how to make a rolled canvas / bedsheet
Piece 1 : original plastic piece, which I fucked up by brushing it with strong solvent.
Piece 2 : pick a large piece of soft paper (like scottex), drench it with PVA glue mixed with water (50/50), let it dry 24h
Piece 3 : mix PVA glue with acrylic, lay down a relatively thin layer on a clean piece of glass, let it rest for 24h, use a scalpel to remove the initial part and then use your hands (cut the borders beforehand with a hobby knife).