I recently repaired the bottom of forum member Just Bill Gheenoe. He had run over some rocks and tore or wrather ripped the stern section of his keel off down to the glass. you could see daylight through it. Useing epoxy resin and additives I patched the hole and filled all scratches and gouges in the hull. Added two layers of fiberglass cloth over the main patch area and another layer along the entire keel to bow. I then added two layers of epoxy/graphite to entire hull bottom. This makes it almost bullet proof. Total weight of repair was prob. only 1 to 2 lbs. added to hull. I am guessing 1 lb. I am located in Crystal River just 1 block North of the Ford Dealership on Hwy 19. I work out of my home. I am offering Gheenoe repairs and entire hull bullet proofing. (Figure of speech)Cost for labor and materials $250. The boats needed to be emptied and all equipment needs to be removed. Reason being is that hull must be flipped over for the repair. Any other repair work will be adjusted accordinally. I only use epoxy resins . You will never have a leak when its done unless you run a steel rod through it. I can be reached at captkowens at gmail at dot com I can usually do this on a four day turnaround.