Michael Horowitz wrote:

I know when spraying paint folks advise you to have something in the
line to dry the air. Is a dryer necessary if I'm spraying abrasive?



Yes.

Get the big, all-metal jobber from HF. It has a drain for any trapped
water. Set you back $20 or so, but I have it bolted to the side of my
compressor cart. The instances where you want water droplets in your
compressed air are few and very far between.