Be nice if all would put the Town/state in where the Join date is on the posted page, I have both pipe threading equipt and soldering/braizing/welding tools and would be happy to help thoose who needed either the equiptment or tech help to install pipe/copper.
Unfornately I sold my power vise years ago, but threading pipe manually just takes a bit more time and isn't all that hard.
Whether PVC is rated for it or not, I know of three people who had it come apart on the, me being one, and when it does there's the chance of pieces flying off and striking someone...
You always wear protective eyewear in the shop? How about that daughter/son/wife that comes out to say hi?
If I was going to go back to painting bikes/cars, I'd be more concerned with the water/particle filters I used than if copper or black pipe controled moisture better, drip tee's/traps at the end of each run will probably do more than the material you use.
I think I used 2 water traps and 2 filters on the line I used for painting, and those I got at a commercial supply house.
Nothing is worse than to be in the last stages of painting and have the gun spit out a chunk of water, especially when doing metalflake...
I like black pipe also as I can hang stuff off it...
Al ......light stuff btw...