I have a 1970 Bayliner Tri-hull that was stored uncovered in western Washington several years before I bought it. I could never seem to get much speed out of the 65 Hp Mercury outboard that came with it. This spring I was in the process of re-building the seats and noticed that there was water oozing form the screw holes. I have since removed approx. a 4X6 ft section of the deck and found the flotation foam to be soaked. What is the best way to remedy this situation, other than scrapping the boat?