Currently, I'm rehabing a set of steel hand rails at the lower pool at the Cary YMCA. They have rusted off at the concrete. I cut a section loose, dig out the old setting mix from hole in concrete (a real PITA!), then weld a stub back on to rail section. Next I strip the rail down to bare metal, also a PITA. Then I have to prime and first coat before setting back into concrete. Today, I used my HF 20oz, High Volume, Low Pressure, Gravity Feed Spray Gun (47016/67181) to spray primer using my twin stack oil less compressor. Primed using Rust-Olem rusty metal primer. I didn't need to thin primer, as it laid down beautifully, with very little over spray. For $15.99 (current price) I consider it a true HF Gem, but when it's on sale (usually with a coupon) for $9.99, it's a better gem! I put this thread here instead of finishing as several here have / are rehabing an older machine and will need to paint it.