Interlux Aqua-One Performance WaterbaseAblative. Delivers solid season-to-season protection from barnacles, zebra mussles, slime, algae and other forms of marine fouling. The ablative action wears away with use, minimizing build up and heavy sanding. For use below the waterline in salt, brackish, and fresh water. Apply on power or sail, fiberglass, wood and properly primed metal hulls. Not for use on aluminum.