Ok, so ill keep everyone informed, and thanks for all the help. So far, I have mixed up half a quart of resin, taped the bottom where the leak is, and poured it in the hull. I then rocked it very slowly to let it coat the inside. Seemed to work well and I could tell it got down in the crack from the color the tape turned. Next step is to get it flipped over, give it a good sand, and strip off a quarter to half an inch of gelcoat with my sanding disc on an angle grinder. Then im going to lay down layers of glass tape, sand and even it out. I figured that since I'm going to all this trouble, while I'm at it, i'm going to sand out all the scratches and dings, bondo them, and then I'm going to attempt to gelcoat both pontoons by myself. I've got a wagner paint sprayer that I dont care about. Wish I could find my circular sander, I'm thinking it's going to be hard work. Any more advice?