Quote:
Originally Posted by Darwin Maring
Be very careful and dab some on the back side of the flair.
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If by "the back" you mean the side the nut bears against, I think all this is doing is keeping the nut from seating evenly against the flared tubing, and thus potentially interfering with the fitting working properly. The nut in a flare fitting is entirely mechanical; the seal is entirely between the inside surface of the flared section of the tubing and the conical part of the fitting. Sealing between the nut and tubing accomplishes nothing.
I'm not sure what "back" and "front" would mean in a flare joint. "Inside" and "outside" of the tubing seems clear.
Quote:
Originally Posted by Darwin Maring
Every nut and bolt on that thing was safety wired to prevent it accidentally coming apart in the air. To this day I use thread lock and thread sealant where I can just to have the additional peace of mind.
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Sure, but safety wiring and thread locking material prevents accidental loosening of the fastener and neither interferes with or attempts to reproduce the action of the fastener. Sealant on a flare fitting isn't helping it.
If the problem with a flare fitting was the nut loosening, then thread lock
on the threads (nowhere near the flare) might help, but does this ever happen? I have never heard of it.