KBS Coatings 52050 Large Cycle Tank Sealer Kit, Seals Up to 12 Gallon Tank The KBS Large Cycle Tank Sealer Kit contains everything needed to seal a tank of up to 12 gallons. It is an All Inclusive Kit! This Kit Includes KBS Klean, RustBlast, Tank Sealer, Gloves and Complete Directions. The Tank Sealer Permanently seals pinholes & weld seams and is Impervious to all fuels, alcohol additives and most solvents. This Kit eliminates all rust and corrosion meaning no clogged fuel filters. The Tank Sealer is flexible and able to expand and contract with your tank.