There you go, since you had no previous problems, The first question to solve is...what did they use? I would call them and see if you can find out. #1 they may have used a hard bottom paint which isn't the best for a boat kept in the water, more for boats that go in and out on trailers. #2 I know you said it was new, or maybe new to you? but was the bottom paint fresh this season, Some ablative paints are not multi seasonal, and must be repainted every season. Even if last years paint job still looks good unless it is a multi seasonal paint it will not perform well a second season. Lastly you really need to find out what they used so that you can make sure that whatever you are going put on top of it will be compatable, if not you can wind up with a real mess, hope this helps, Mike