Non-hardening. Lubricates, seals and prevents rust and corrosion on threaded pipes. For PVC, ABS, CPVC, polypropylene and nylon pipe. For gases: withstands up to 3000 PSI at temps -50F to +400F. For liquids: withstands up to 10,000 PSI at temps -50F to +500F. Use on water, steam, natural and LP gas, oils, fuels and dilute acids. Not for oxygen systems