Permatex 80632 Polytetrafluoroethylene Thread Sealant Liquid, Compact, 113.0 grams

Works as expected

Like most Permatex products it is a quality product. Perfect for air and HVAC fittings.

I absolutely love this stuff. I’ve used this Permatex PTFE thread sealant on two complete vehicle engine builds, and I’m only about halfway through the bottle, which says a lot about both coverage and value. A little goes a long way, and it applies smoothly without making a mess. I used it on cylinder head studs, intake fittings, transmission line fittings, oil cooler fittings, and several other threaded connections exposed to oil, coolant, and transmission fluid. In every case, it sealed exactly as intended—no seepage, no weeping, and no loosening after heat cycles. What I like most is that it seals while still allowing proper torque, unlike some sealants that either over-lubricate or harden too much. It’s held up against coolant, engine oil, and ATF with zero issues. Threads stayed clean, fittings went in smoothly, and nothing backed out during assembly or operation. This has become my go-to thread sealant for engine and drivetrain work. Reliable, efficient, and long-lasting—one bottle easily handles multiple builds. I wouldn’t hesitate to use it again on future projects.

Ottimo sigillante per tubi raccordi ecc lo uso spesso davvero da avere sempre

Works great on bolts subjected to petroleum. Oil bolts, intake bolts, and any bolts that needs thread tape.