Well, if I am running off shop air, their system is pretty dry, I have yet to see any moisture in the lines, and my service truck gets purged a couple times a day at both tanks, and filters (where I rarely see even a spit of water). Regardless, I have the supplied air filter/water separator, followed by a motorguard M60(?) before going into the unit. I don't see the telltale signs of moisture on the electrodes.
Sticks
Field Service Tech for a Concrete Paving Company
Location: The corner of "No" and "Where"
"If they break it, we will fix it"
AKA
"Find some scrap and build a new one"