I have used the Wagner power sprayers a few times. IF it involves paint, ... Don't even waste your time ... spend the money on something more useful, like rattle cans of your chosen color.

Wagner Sprayers don't use air to mist the paint, they simply force the paint out a small hole under pressure. No matter what settings and nozzles I have tried, thinned or not, I have pretty much needed a roller to go over some if not all of the job afterwards.