we've been using aquaguard on the dinghy(in the water all season) and hydrocoat on Escape and they both work really well. Escape's mooring is in an area with a lot of tidal flow and it keeps the bottom really clean, but we do touch up the leading edges of the hull, keel, and rudder every year. A breeze to apply, and cleanup is simple. The Maine clean harbor rules don't allow you to sand or scrape - the yard has to do it and contain all the waste - but hydrocoat doesn't need that; most yards will let you do your own paint with hydrocoat as long as you follow the rules.