Kreem Gas/Fuel Tank Liner, Sealer, Sealant Kreem tank sealer creates an excellent "tank within a tank" Advanced sealer formula cures to a tough white skin which protects the inside of the tank from rust and corrosion Resists leaded and unleaded gasoline, octane boosters or fuel additives when used in recommended concentrations Kreem is safe for Ethanol and Oxygenated fuels 1 pint (473cc) bottle, sufficient for petrol tanks up to 5 gallons