RPL is an outstanding final finishing oil repellent top coating for boats, RVs and cars that are having problems with persistent exhaust soot and carbon based pollutants. This boat has been coated using Glidecoat Pro Marine Ceramic Coating with RPL as a final top coating. After coating, the sticky, black sludge that builds-up on the waterline easily brushes off with a little bit of water - no need for harsh chemicals.