It’s a Sealant: Nylon is a viscoelastic fluid made from refrigeration grade compressor oil. Threaded connections coated with Nylon will prevent high pressure leaks by forming a hydraulic seal. 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.