Copper Shield Uno™ provides full season antifouling protection against barnacles, algae and hydroids in salt and fresh water on boat bottoms only. Its ablative copolymer base renders a smooth finish with durability and abrasion resistance. Copper Shield Uno™ releases biocide by the constant exposure of new paint film to the water. Copper Shield Uno™ has universal application over all types of properly prepared bottom paints (except aluminum). For use on fast fiberglass boats, as well as woodand steel hulls.