The only problem with this paint is it isn't terribly durable. Which is ok if one can fix it, but not so great to pass on to someone else. I bought some machines with nice paint jobs, and they were marked up in transit from pretty gentle handling. I don't know what color codes the folks who originally painted them used so patching isn't going to work.
Don't know about a wagner sprayer but there are a lot of inexpensive chinese HVLP guns that are designed to work with regular compressors. They work great, cost a few bucks and could almost be tossed they are so cheap when they come on sale. But it would be a shame.