On Mon, 16 May 2016 21:18:00 -0600, rbowman
wrote:

On 05/16/2016 02:06 PM, wrote:
I was told this about not using teflon tape back in the late 70's or
early 80's. What I heard was pretty vague, and I dont recall who said it
anymore. A

Some of the problems are caused by people putting it on backwards.

True - but even "properly" installed it can scred - particularly on
crappy chinese black pipe with "ripped" threads.