GOING TO BOTTOM PAINT BOAT FOR SEASON BOUGHT IT USED LAST YEAR UNKOWN WHAT TYPE PAINT IS ON THERE CAN I GO OVER IT WITH ANY TYPE OF PAINT OR DO I HAVE TOO USE A SPECIAL KIND BOTTOM IS FAIRLY CLEAN ALSO IS IT TRUE U MUST LAUNCH BOAT WITHIN 72 HRS AFTER PAINTING .ALSO ANY TIPS ON PAINTING BOAT WHILE ON TRAILER WOULD BE APPRECIATED THNKS IN ADVaNCE BOAT IS A 21 FT W/A