It's a Sealant: Nylon is a viscoelastic fluid made from refrigeration grade compressor oil. Gaskets coated with Nylon will never dry or become heat fixed to the surface. Threaded connections coated with Nylon will prevent high pressure leaks by forming a hydraulic seal. The compound always remains temperature and vibration resilient. It's a Lubricant: Nylon can be used as a high tack assembly lube when installing shaft seals, O-rings, Schrader valves, ball valves, unloaders or other system components. Nylon is fully miscible and 100% compatible with the refrigerant and base compressor oils. NYLOG RED Is based on Mineral Oil and used on Ammonia, Propane, CFC or HCFC systems. NYLOG BLUE is synthetic ester oils fully compatible with all systems including those based on PVE oil, HFO refrigerants and CO2. Will Never Harden or Dry Will Not Clog or Contaminate Systems Fully Compatible and Miscible Used and Recommended by OEM's