My driver front floor pan has some heavy pitting and has a few pin (pin head) size holes. Aside from welding in a new one (which I can't do) Could I use a polyester filler or some sort of epoxy resin to fill then use por15 over? I will also do the bottom side of the floors with por15. I know some fillers are more resistant to moisture than others - what would be recommended? I thought of using a carbon fiber sheet with resin but not sure if that is the better route since the holes are pretty small.