I am a drywal finisher and i offer spraying primer and ceiling white. I do 10 to 20 gallons a month. i use a Magnum DX by Graco. Got it at Home Depot after speaking with a rep at a trade demo one morning. It is small, simple to use and cheap... 300 bucks. i got the 50' hose and the long tip extension, xtra tip and preservatives. $400 and i sprayed thousands since February/march 2004. I offer primer and ceiling white, especially to high ceiling jobs. no color hassles. I use a pitch to home owners and builders that: "I do the heavy lifting and overhead work." They jump on it because do-it-yourself homeowners only want to apply pretty colors. primer and ceilings are too much workfor them. I am spraying my own house exterior now with great results.