Water Damage
Sounds very similar to my issues, three areas in all, all due to poorly sealed window frames. My interior plywood is really just a skin over foam (1/16"). Anyway, I did use a high adhesion primer prior to paint. It does help seal the repair area, no bleed through or coverage problems with the paint. So far after 1500 miles on some nasty rattle-bang roads the repairs show no sign of failure. Have fun, hope that works out for you.
Greg, Karen and the pups.
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