Soft-setting PTFE paste provides a positive seal on pipe threads, joints, fittings, hoses, nozzles, LPG cylinders, pump assemblies, oil burners, hydraulics, bolts, compressors, engines, motors, housings, plugs, fuel lines, couplings, and more. NOT for use on oxygen. For use on brass, copper, stainless steel, aluminum, black pipe, tin, galvanized, PVC plastics, nylon, polyethylene, polypropylene, polybutylene, and more.