A discussion on the causes of "Osmosis", the appearance of blisters on the bottoms of fiberglass yachts both power ana sail alike. A description of symptoms observed by a Marine Surveyor during the last few years of practice, a simple explanation of the probable causes, followed by a technical discussion of the problems faced by industry in their attempt to eliminate the disease. Finally some suggestions as to prevention and cure in existing vessels and those still to come off the production lines.

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