At this time, I still don't have airbrush and compressor. It's the important tool for my works (especially if I want to build AFV models or Diorama). Because even all of my minis were painted with a brush, but for the priming and coating (Flat clear) I always used an airbrush, which better than using a black primer spray or super clear flat spray in my opinion. And of course, airbrush can do many things better and faster than a brush, this is the important tool that I must buy asap.
Lastly, I'm not sure about the correctness of grammar while writing this article. Hope it's better than before and I'll keep practicing for the better. :)