I know that teflon tape is not to be used on compression fittings, i.e. on threads. However I have a connection that is being very difficult. I cannot stop the fitting from "weeping'. I have tried new angle stops with the same results. I tried wrapping the pipe with a single reveolution of teflon tape to see if the compression washer would slide over it and it will. So the teflon tape would be between the compression washer and the copper pipe, not on any threads. I haven't tried tightening it yet. What-da-ya-think?
Steve

I think you should learn how to install compression fittings properly:
Home Depot Moving

It's not likely the new angle stop.

I am not going to insinuate you don't know how to install a fitting but there could be another problem other than you. The pipe may have a flaw or is out of round. When you cut off the old compression fitting did you use a pipe cutter or a saw?

Just to be sure 1st slide on the packing nut then the ferrel, push pipe all the way to the base of fitting, hold it there while you tighten the nut. Don't over tighten just enough so no leaks. If all else fails you can use some permetex (black sealent) alow it to cure before turning on water, but if you use this method next time you will need to replace the fitting as permetex is perminate.

The Home Depot instructions say to cut the tubing and then turn off the water, hope no one follows their instructions step by step, the hack saw always leaves a deformed end.

acetc:

Won't you get wet?

Not me because I know better.

This is the first time "Not me" was smart. "Not me" tends to get blamed for everything.