I use (still, slowly but surely) an airbrush (Paasche VLST-PRO) and a touchup mini spray gun, the Iwata LPH-80, I have a couple.... One tip (pun) is plastic containers aren't worth a chit except to mix in. Yogurt cups are handy. A good airbrush is pretty slick. The VLST-PRO uses screw-on glass containers and is well made for repeated usage (CLEANING). Duracoat is mixed a simple 1:12 ratio so stainless teaspoons and tablespoons.... Lacquer thinner. More hardener is shinier, less is - LESS. Tactical flats are the ones to get if you don't want shine.
Thanks. Your work looks good!
What compressor are you using? What PSI?