Southern Polyurethanes (SPI) sealer is a quality product used to protect the metal from corrosion and rust often caused by sun and extreme weather conditions. It is availbale in gray, white or black and in gallons or quarts. It activates with #6501-4 (regular build primer activator - included with purchase) and has a 4:1:1 or 4:1:2 mix ratio as a sealer with activator and reducer. The reducers used are #870, #885 or #895 (Reducer not included with purchase).