Best way to seal an air leak?

[MKing]

I have a slow leak on the tank pressure gauge on my max flo regulator. I dipped it in water to confirm that it is leaking around the threads.
The threads look good but I can't get it to stop leaking. I have tried locktight and a couple tries with plumber's tape with no luck. What would be the best way to get it to stop leaking?

[Ebbed]

http://www.youtube.com/watch?v=-W8t7CVk-zU

[maniacmechanic]

I don't know why but I allways use 7 wraps of teflon tape , the thing about pipe threads is they are a tapered thread , if you screw something in TOO tight , the next time you screw something in that hole it may not seal

[MANN]

2-3 wraps of teflon tape is what is suggested

[Spider-TW]

I find that teflon pipe sealant (paste type) will often work where tape keeps failing. It doesn't harden and comes in different grades. I just use the common steam/water/natural gas stuff, but there's industrial grades that do better.

[MKing]

Thanks, I will look for the paste. I have tried up to three wraps with tape and it would cause the leak to be very slow (a full tank leak out would take about 2 days), but just knowing it is leaking is irritating.

It is a removable regulator so taking it off and working on it isn't a problem.