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An oil-less air compressor uses sealed ball bearing on the crankshft and the bottom of the piston rod. Most have a replaceable sleeve of teflon or aluminum in the cylinder <br />and the piston has fiber or teflon rings that will seat to each other without galling like metal to metal with no lube will do. This type of compressor is perfect for airbrushing. I have two air brushes- A Thayer & Chandler that was a hand me down and a cheap but unbelievably good Testors. They are both internal mix dual action. There is a brush made that can be set as internal or external mix but I have not been able to locate it on the internet again.
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