I can appreciate the reasoning for not using ptfe tape, but it has been used in air systems for donkeys years, which suprisingly include our amazing solenoids.it will work buddy, its just that PTFE breaks down into small bits and can get into the airways of the marker and potentially lead to dead solenoid's ..a lot of people use it but I wouldnt recommend it for anything if you dont have to loctite
Yes that's where the solenoids come from.