Nylog White Gasket & Thread Sealant

I am a automotive mechanic by trade but repiped my own house a few years ago so I ended up a lot of extra because a jar of this goes a long way - much further than the 1200sqft house of mine with mostly PEX-A connections, as I used this in place of pipe dope on threaded connections. I was working on VW Mk6 GTI that was back a 3rd time after leaking coolant again, frustrated, I bathed all the gaskets in this stuff, hasn't had a single drop leave the closed cooling system since. The 500F limit is more than enough to handle the temperature that it will see (190F is where the temperature levels out, 270F is DANGER). I used it to lubricate and seal gaskets between the (high pressure) fuel rail and injectors, I use it now on my shop's compressed air system, literally anything I can justify using it on. My shop buys this stuff by the case, and I've turned on my friends and colleagues in the automotive world to this stuff.

I'm an HVAC contractor who uses nylog blue on ductelss systems - it's a great product and works every time. I thought, why not nylog white for my hydronic projects? I bought two jars and used them on every threaded fitting. Almost all of the connections failed. Some of them failed days after I thought the install was complete. I had to go back to the job several times to redo connections I had already made with Teflon tape. This stuff cost me several thousand dollars and put my reputation in question with a key client. Don't make the same mistake. Use something else.