Gold Standard Tank Sealer is a superior, single component, ready-to-use sealer formulated for coating the inside of metal, aluminum & fiberglass tanks. Widely recommended & easy-to-use, this single application coating cures into a tough fuel impervious seal. The entire tank including pinholes & weld seams are permanently sealed to prevent the return of rust & corrosion and clogged carburetors. The Tank Sealer's rock hard finish remains flexible to withstand vibration and the repeated expansion & contraction of the tank! Other sealers are little more than paint or adhesive-type coatings which have poor sealing abilities especially when exposed to today's fuels.