In my fresh water experience a hard racing antifouling bottom paint should work well as was mentioned before. If the bottom already has a sluffing paint you may have to stick with it or do all the work to take it off. With a hard racing antifouling you can always apply a soft paint over, but not the other way around. A soft bottom paint in fresh water in the north works well if the boat is used frequently. If it sat in a foul slip I may go the other way. If the boat is trailered I would for sure use the hard paint. Washing the hard paint is a lot easier. Dennis Raedeke Wild Wind IV