BONDING PRIMER: A high adhesion primer that bonds ... chalky paints, glossy finishes, fiberglass and metals. Topcoat with either water or oil-based paint. For use on interior and exterior surfaces.

The better the prep, the better the final result. Pitrat recommends priming wood and fiberglass doors with an acrylic primer. For metal doors, use a metal primer, or skip the primer and use a ...