[beautimus]

in reguards to the condensation problem, the advice your getting in the rsponses above is golden. one note on the humidifier, get one of those that has an adapter for a garden hose. when you get it, set it to run continously for a couple of days to get the moisture out of the air.run the garden hose to a drain or pipe it out thru the wall. then set the setpoint to about 50 percent humidity and let it cycle on and off as needed. you won't believe how dry your shop will stay, and how much water it will extract over time.

As for the air lines, pvc will work, but the glue joints don't like some compressor oils. it can weaken the glue over time. plus if you get the condensation stopped you wouldn't have to worry about metal air lines dripping. best of luck to you.