I have found that clear nail polish will prevent growth for several years. Bill Ahrens Tucson Sailing Club Sent from my iPad On Dec 1, 2012, at 9:49 AM, janisaz@comcast.net wrote:

We leave our M17 in the water for about 4 months in British Columbia. Does anyone have any info/experience with a clear bottom paint or coating that will prohibit the algae growth but not interfere with the beautiful lines of the boat? Janis Johnson