Ideal for antique or classic cars where replacement tanks are unavailable. To use, remove fuel from tank. Ventilate thoroughly. Remove tank from vehicle then take out parts (sending unit, float, etc.) that could become clogged by sealer. Pour sealer in tank and slosh to cover entire inside surface. Let air dry 24 to 74 hours, then re-install in vehicle. Note: Not for tanks using alcohol-enriched fuel. One quart can will repair one auto gas tank. Alcohol-Resistant Gas Tank Sealer. Unaffected by alcohol additives or alcohol-enriched fuel.