Hey Claydoo. I can speak to this a little. Last summer I decided at the last minute to leave my 210 in the water in Oriental, NC on the Neuse River. I planned to come back several days later, but ended up not getting back for three weeks. I couldn't believe the crud that had attached itself to the hull. A lot of it powerwashed off, but I've still got to climb under the boat and do some serious scrubbing. I'll never leave it in the water again, but I don't think I'd want to go the bottom paint route either.
