This product converts rust to a permanent, paintable surface. It chemically reacts with existing rust to create a permanent surface that prevents further rusting and may be painted or left as is. It is not necessary to remove the existing rust, as the rust is necessary to set up the chemical reaction. The resulting black surface is weather-proof and permanent without the need to scrape the rust and eliminates the need to prime or phosphatize the surface. Dries to a semi-gloss black finish that can be left as is or painted. Ready To Use.