Improved Methods for Shipboard Evaluation of Antifouling Paints

Improved methods have been developed for the shipboard evaluation of antifouling paints capable of extended service exceeding five years. Underwater photographic documentation enables the close-up study of antifouling paints while the ship remains in-service. Test panels secured to the outboard side of the bilge keel permit the testing of a large number of candidate antifouling paints under actual service conditions. Underwater measurements of roughness have provided revealing histograms that permit the comparative evaluation of ablative antifouling paints. The suspected environmental impact of the organotin antifouling paints has imparted new impetus to the development of ablative paints targeted to calcareous fouling organisms.