This 3 step repair kit is designed to repair the interior of metal gas tanks for cars and trucks. Designed to repair up to 12 gallon tanks. If you have a 13 gallon and above tank you can purchase an additional quart of liner material which is our #18988 This 3 step kit gives you a cleaner, a self etching prep solution, and the liner repair material. This liner material resists gasoline, alcohol, diesel fuel, and all additives. Seals up to 1/8" pinholes. We recommend our Exo-coat exterior urethane coating for extra corrosion resistance and sealing. See part number #RW0126 for our exterior sealing kit. Cannot be sold in California for EPA regulations.