Hernon® Weld Sealant is a single component anaerobic penetrating adhesive and sealant. It is designed for sealing weld seams against leakage as well as lock threaded metal fasteners that are already assembled. Weld Sealant can fill seams up to 0.127 mm wide. The anaerobic sealant seeps into voids and then cures in the absence of air to a hard thermoset plastic. The excess surface Weld Sealant can easily be wiped away. Weld Sealant can retain fluids and pressure on welded seams up to 400°F (240°C). Weld Sealant is impervious to most solvents. Welds, castings, and powder metal parts can be sealed to their rupture pressure.