Overhull is an environmentally friendly way to clean your boat, dock, or marine equipment without affecting marine life. It safely removes mineral scale and algae buildup without all the harsh and dangerous acids. Overhull is specially formulated to be non corrosive to skin, while being tough enough to remove heavy scum buil-up from the marine crafts surface. Overhull is safe to use on all surfaces and will not affect the paint, gel coat finish, fiberglass or metals. Overhull can be used to clean or remove oxidization on aluminium and all marine surfaces. Overhull is 100% biodegradable!