dont worry about an air dryer, no need, if your that worried about moisture, you can get a WHIRLWIND inline filter at the paint store for like 5$. itll work fine. dont buy a P.O.S from harbor freight either, they suck, even for one time use, just borrow one, trust me, ive been painting for about 8 years now, ive seen people waste money on those things time and time again!