Note that it is always best to use brush-on pipe dope or a pipe dope stick as mentioned above instead of Teflon tape where you are doing compressed air or propane.
Teflon tape sometimes releases shards of teflon into the gas or air piping that float around and look for trouble to get into. This can cause issues downstream with valves, regulators or appliances eventually. Since teflon is impossible to remove with solvents, this is a generally bad thing (tm).
Be sure in any case to use teflon tape or pipe dope that is specifically documented as rated for propane.
Also, there is specialized teflon tape specifically rated for gasoline--its usually yellow and a lot thicker. Regular white teflon tape is not the right stuff in this case. Home stores may or may not have the right stuff for gasoline use.
Read labels carefully and be careful working on propane. One spark plus a leak can spell instant disaster...
Please note that is a a fundamental law of nature that ANY project requies at least three trips to the home center. Dunno why that is true, but 40+ years of observation leads me to that inevitable conclusion!
'The Silver HamShack' (2007 International 22FB CCD 75th Aniversary model)
Multiple Yaesu Radios inside and many antennae sprouting from roof, ProPride hitch
2012 shortbed crewcab 4x4 Toyota Taco TV with more antennae on it