You're probably right. I was just going by what the guys told me at the SeaSport factory told me when I bought my boat. They said I could use lacquer thinner to my heart's content, tho. I really don't see any need to use acetone, anyway.Cured fiberglass resin (polyester) is not effected by acetone. Acetone is used for cleanup in the laying up process but once it's cured acetone wont do a thing.