I banged up the bow just above the blue strip (waterline) and damaged the gel coat on a rock. The gel coat is removed, exposing the fiberglass core that does not appear to be damaged. The area is about 6" long and 1" wide on the right side but extending slightly over the ridge on the the bow. Can anyone tell me whether epoxy or gel coat is used to repair this type of damage on the hull? How much material is needed and what brands or type of gel coat ? Thank you for your help!