Oh and definitely put at the very least a filter and preferably a dryer in line or other wise you will have fish eyes popping up. Which looks ugly and requires mek with very touchy rag to smooth. Then ...
My 2 cents. I've got a lot of experience over past year with poly system. Go to harbor freight get 20$ hvlp paint gun. Air supply should be 40#. you will have to adjust spay pattern nozzle and volum t ...