I have started keeping my Pontonn boat in a slip, rather than trailering it. It has been in the water (Fresh) for about 2 weeks. I am already starting to notice a growth on it. Short of painting the pontoons does anybody know of any product that will help and that works. I was looking at a product called SharkHide. I posted a question asking if anyone has used it but got no replies. Any help would be appreciated.