TANKWELD EPOXY PUTTY - 2 OZ

TankWeld is a steel-reinforced putty made for metal tank repairs, mainly steel and, with careful prep, aluminum. It sets in about 5 minutes, cures in an hour, has a tensile strength of 4000 PSI and is rated to 300°F. Drain the tank as far as you can, sand the area to bare metal, and clean it with acetone. Keep the area free of fuel while it cures.

No. TankWeld is designed for metal tanks. Plastic fuel tanks are usually polyethylene or polypropylene, which epoxy will not bond to, and J-B Weld does not offer a repair product for them. Vibration makes a plastic tank patch even less likely to hold. Replacement, or plastic welding by someone equipped for it, is the dependable fix.

It can seal a slow drip in a steel diesel tank, but the oil content in diesel and kerosene tends to work under the patch and loosen it over time. Treat it as a temporary repair and inspect it regularly. The surface must be completely free of fuel and oil when you apply it, which is difficult on a tank you cannot remove and clean.

No. Do not use TankWeld or any epoxy on an air compressor tank or a pressurized vessel. A cracked or corroded pressure tank can fail explosively, and drilling or patching around a crack creates stress risers that make failure more likely. Replace the tank. The 4000 PSI rating describes bond tensile strength, not burst pressure, and does not apply to containing compressed air.

Sand the area down to bare, clean metal, remove rust and paint, then wipe it with acetone. Do not use rubbing alcohol; it leaves residue and is a common cause of the putty not sticking. After it cures, TankWeld can be drilled, tapped, machined, ground, filed, sanded and painted, and it cures dark gray, so you can finish a tank repair to match.