From the www.epoxyglue.com
site: "You cannot use auto filler (polyester bog) on your boat. You may experience adhesion problems on a flexing hull
. You will have little protection if water
gets to it. Heard of osmosis
? There could be shrinkage problems. There could be shadowing with un-reacted styrene monomer, a solvent in polyester bog, reacting with the top coat. EPOXYBOG, our name for epoxy fairing compound, eliminates these problems. The secret is in using epoxy resin as the base. Epoxy reacts with, in this case, an amine hardener, to form a densely cross-linked polymer with exceptional adhesion and strength. It is a pre-filled, trowelable, epoxy putty, that feathers out and sands easily. It is very strong because it chemically cross-links to cure. Adhesion to a properly prepared substrate is exceptional.
EPOXYBOG, an Xtra lite, and creamy low density trade