They list PVA Jens, not PVA adhesive! PVA is a rubbery solid at normal temperatures.Polyvinyl acetate is just a fancy word for PVA, thus providing the liquid bonding agent to the zimmerit
What I listed was the "official" ingredients from the zimmerit manufacturer Chemische Werke Zimmer & Co but that doesn't cover for stuff they perhaps mixed in with the goop to stretch the supplies?
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