if it's just gel coat thinner won't hurt it. it will strip all the wax off though so you'll have to re-wax.
If its a painted boat you better try it first.
Is this an aluminum boat thats been painted?
I had a bunch of that crap on a black Audi. The bug and tar remover wouldn't touch it...anything harsh enough to remove the paint would strip the finish right off.
Fortunately you couldn't see it unless you were really close.
Hybrid Mode
