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Originally Posted by Lesley Grindlay
I dont know bout the flour thing, would it not eventually rot?
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Not if the flour has a low gluten content, like pastry or cake flour. You need some gluten for adhesion but not much. Dry flour can become rancid in a few months, so that's another reason it's not often stocked for wallpapering. Properly made wheat paste is very archival. Freshly made paste is acidic, but calcium carbonate buffers the acids, and fungicide helps keep the bugs away. Some brands of wheat paste/starch require cooking/boiling before using (food grade,) but there are others that you just have to add water. If it's a heavy-weight canvas, I'd probably use a stronger glue.
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