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In the bead form, If stored in a dry place away from light, I believe
the shelf life is very long indeed. Polyvinyl acetate is a plastic. Once
dissolved in acetone it would depend on how long it takes the acetone to
evaporate. Weeks most likely. What you will notice over a period of time is
the mixture getting thicker and thicker until all the acetone is gone, and
the PVA sets. I have heard that the PVA is prefered over Butvar because it
last longer on the specimen without discoloring. I have heard over 100
years, but I can't back that up.
JOHN Van Regenmorter
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