Nylog is worth every penny. It's not too expensive either. Just a dab will do... Had a industrial refer tech introduce it to me and I've had it in my tool bag for 3 years now. Keep the blue pipe dope for pipe threads.. Nylon for anything refer. I've sealed gaskets and other joints with it.
I put it on everything including all of my Digital manifold and hose connections. Its also great on your evacuation connection setups. I ripped through three bottles of the blue this summer and i don't use alot on each connection. Just a few dabs and when you screw on the fitting it disperses perfectly! Once i found nylog last year i threw that blue leak lock goop right in the trash!!! I got sick of finding that stuff suck in screen of TXVs and plugged in fixed metering devices because of installers applying to much of that crap on flare connections!!! LONG LIVE NYLOG!