Yes, you want MARINE plywood, not PRESSURE TREATED. Resin adheres better with out the chemicals. I would think if the resin is unopened and sealed up tight it could still be used. Like mentioned before make a test batch first. Probably a good idea anyway no matter how old.
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1985 Wellcraft V-20, Evinrude ETEC 150: SOLD
1979 Marine Trader 44, twin Ford Lehman 120s
2006 Panga 14, Tohatsu 20
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