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Summary: A pneumatic paint gun, or a spray gun, is a conventional painting device that has an airline and material line. Discover how the internal and external heads work on a spray gun with help from a professional painter in this free video on using pneumatic paint guns.
"We had people ask us about pneumatic spraying, pneumatic guns. The common name that we use for that is a conventional spray gun. And a conventional spray gun is one that has a airline that goes into the bottom here. And it has a material line that goes into here. This is actually a cup gun where the material is in this cup right here at the top, feeds down, it's a gravity feed where when we are going to use a gun like one of these, this is a DeVelvis so is a Binks. This is the material right here where the line comes off this pot and goes into this right here and then you have airline going into this. And then material adjustments right here and the air adjustment is right here and then you can change the fans on it by just changing which way the cap is for the actual external head. Right here there's an internal head and external head. This is external atomization to where the air that comes out of these little holes, material comes out through the middle and it breaks it up and gives you a fine finish. So you can adjust all of that. But that's when they talk about pneumatic, this is what they are talking about. There is some guns and years ago they called pneumatics but it is a conventional because it is material and air mixing, atomize outside of the head of the gun. It's, they had a pneumatic airless which is air instead of electric, it's the same thing as the regular airless we use today which are electric. They do have a larger airless that are pneumatic that work off of a large compressor where you are pumping a lot of paint, like a President or a Bulldog things like that when you are doing fairly large commercial jobs. It's not something that somebody wants to have on a residential house."
eHow Article: How to Use a Pneumatic Paint Gun