I know a few folks that have used herculiner on the interior of their boats, like on the floors after making repairs and such, some of them that have done the normal finishes, then cover it with the liner, some just put on the liner instead of wasting the time with the normal finish.. so you should be fine doing that.. that is something similar that I plan on doing with the few minor holes I have in my floors of my 90, so long as they don't turn out to be worse once I really get into checking into them...