This is a bottom side paint made with 25% copper. New England Copper 25 provides anti-fouling 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. New England Copper 25 releases biocide by the constant exposure of new paint film to the water. New England Copper 25 has universal application over types of properly prepared bottom paints (except aluminium). For use on fast fiberglass boats, as well as wood and steel hulls.