Our Marine Hull Coating is a thin, clear, and extremely smooth, quartz coating that inhibits the attachment and growth of most marine grasses, barnacles, and mussels. It can be applied to metal ship and boat hulls to provide better fuel economy and reduced cleaning. Marine Coat is free of pesticides and heavy metals. This coating works on all ferrous metal hulls, and non-ferrous metal underwater running gear such as propellers, rudders, shafts, struts and trim tabs. Marine Coating is also a very effective coating for concrete ponds, pipes, and tanks to help prevent liquid from seeping through the surface pores. The Marine Coating can also reduce the friction in pipelines, allowing liquids to flow easily, thus reducing energy costs. (This product is NOT recommended for use on fiberglass or wood hull boats without Part B Catalyst).