[UCGL_Guy]

After making thousands of fittings up in my 25 years here are some tips.
Don't use tape on pneumatics - eventually you will have pieces that find thier way to plug up a valve. We Never use tape on our process air for that reason. Can you imagine shutting down a huge chemical process plant becase of a piece of tape debris, it happens. There are a lot of good thread sealants you can use. Contrary to popular belief in this area less is better. Again you don't want your thread sealant in your process. Don't over tighten - Brass seals fairly easily. Cross threading - every year we get a least one fitting that is cross threaded and then someone tries to keep it from leaking by using more tape or over tightening, throw away the fitting and get a new one. Remember tape is not the only debris - keep your pneumatics clean.
Have a great weekend
Ken