Epoxy filler is a ready-to use product made from the finest ingredients. Of all the types available, epoxy fillers are the most often used in boatbuilding. They are used during production, and also to repair any damage, dents, scratches, and other irregularities that might arise while using your water craft. Because of their anti-osmotic properties, and their ability to keep water out, epoxy fillers are the only ones recommended for elements of the hull below the water line.