FAQ 91
Question: I've got a Devillbiss (sp?) 3/4 horsepower compressor and wonder if you have any experience with a touch up gun that would run off this? If there's not enough air - I would get specks of paint? Answer: Interesting question. I am far from being an expert on sprayers and compressors. My guess is that a 3/4 (0.75) horsepower compressor is for air brushes and filling tires, so it probably doesn't have enough air for a touchup gun. Yes, if any paint comes out, it will probably be splatter drops. I've got a 2 HP, 8 gallon tank Charge Air compressor, and it is sufficient for intermittent spraying with my (so-called) inexpensive HVLP spray gun. This is with the gun on it's lowest air use setting. I tried a Devilbiss touch up gun (Incidently, I had to look up Devilbiss' web site to get the correct spelling). The instructions with the gun were lousy, so maybe I was missing something. It either just sprayed air and no paint, or made a huge stream of paint, so I ended up returning it. Now that I've used a relatively nice spray gun, I discovered that one key is to adjust the paint volume very low to match air flow. This is a screw on the back that makes the nozzle open just a tiny bit, even when the trigger is fully depressed. This works great on my gravity feed gun. The Devilbiss touchup gun is siphon feed, so the same trick may not work. Please drop me a note if you have good luck with that touchup gun.
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