Originally Posted By DAYCLONA
I'll use either a teflon paste or grease to lube the threads so that they help seat the flare and prevent galling of the threads, using a tube wrench instead of a "regular" wrench will also prevent you from "egging" the flare nut causing leaks by making it harder to fully seat the tube nut sealing the flare, stainless or steel


I have used this method for 20+ years. Sounds wrong, but it works. I can't explain why it works except for the lubrication properties. A dab, not a blob, on the threads and flare. I didn't believe it when I was told either. One night as a last resort I tried it. Made a believer out of me. No leaks ever.
Doug