AI hooked my hose up to the compressor and the air flows threw good. But when I attach the brush nothing. I can't get the air to go threw the brush. There is no paint clogging it that I can see does anyone have any advise. The person that gave it to me never even used it.

Do a Google search on curing the guns. Sometimes there's paint still in there that you can't see. I had the same problem awhile back and that's what I did. It worked.

What kind of compressor? Most airbursh guns require atleast 10PSI to get the paint through

Also brand of brush may help diagnose