Dennis, I used my Harbor Freight 21 gallon compressor to run the sprayer. I'd suggest getting the plastic baggie liners for the sprayer reservoir. That sprayer was suggested by my builder and it worked well. You can put a bit more than a half gallon of paint in at a time. I did thin the paint a little, like maybe 10% or so tap water.
I just peeked at the paint cans a minute ago, seems HD changed the codes to GL 9034. I even have a can of EM 9034. I used that paint for the benchwork and scenery quite on my old layout.
I didn't paint the ductwork because I thought it looked cool as is, that's all. I could have gone either way I suppose. It matches up with the wiring and light fixtures in the non-layout zones.
