Is Permatex Blue Threadlocker Good to Use For 455 Front Cover?

Just make sure you don't need to re-torque the bolt. If you do, you shred the RTV. It may, or may not still seal the threads. It's also a mess to clean-up if you need to disassemble it later.

The nice thing about 592 is that it SEALS immediately, but the anaerobic hardener doesn't fully-set for hours. Thus you can build an engine, torque the head bolts, get it running and warmed-up...and still have some time to re-torque the head bolts if needed without screwing-up the thread sealant. Some of the other sealants in this product line harden more quickly.

It IS a thread sealant.

It DOES have PTFE.

It does NOT have the anaerobic "hardening" chemical, and is not anywhere near as good as the thread-sealing products that do have it. That's what makes 565, 567, and 592 so special.

I worked for a company that installed a giant heap of pipe-thread fittings. The engineering team specified one of the Loctite/Permatex sealers...565 maybe. At that time, the tubes were labeled "PST" in giant letters, I didn't pay attention to the part number. My boss wanted to save money, so he bought two giant brush-top tubs of the "ordinary" thread sealant with PTFE/Teflon. That lasted about a week before the leaks got so bad on the production line that we switched back to the anaerobic-fortified (expensive) stuff. Leak problems went away.

Proving that they were incapable of learning from experience, about a year later Management made us switch back to the same less-expensive product as before. Again, that lasted about a week before the increase in leak problems brought a return of the "good stuff" having the anaerobic chemical included.

So, yeah, the "ordinary" thread sealant with PTFE can "work", but it's a very second-rate product compared to the 565, 567, and 592.

Weise suggests 565. I use 592. 567 tends to be the most-expensive of the three. And I have a tube of the "solid" stuff, and I expect it to work well...but I haven't used enough of it to have an experience-based opinion.

 

Great info guys ... and good debate too lol ! Democracy is alive ? This info is very helpful to all assembling a part or motor requiring sealers ! Thank u all

 

Agreed. Thank you for the help y’all!