I have always tightened them down pretty snug with a little bit of the wife's clear fingernail polish on the threads. Never had any problems. That's how an old man at church showed me how to do it back some 35 or so years ago.
I have a Rock Island 1911 that was Cerakoted several months ago and I have carried it a lot in a nylon holster. On 4 wheeler rides , hunting etc. with no wear.