I use a Pasche VL duel action air brush, which I purchased over 20 years ago, and have replaced 1 x 50 cent o'ring
in all that time, I pull it apart after every session, and leave the parts in a jar of thinners until I need it next time.
It is the best thing I ever brought, as it opens up the whole color spectrum, as you can mix and match anything
you already have in the cans. And you can also play around with shading and muli-color paint schemes too.
And after a few goes, you do get the hang of it, and then find your self playing around with different pressure, for different effects.
What you can do with an air brush is only limited by your imagination, not by what is available in a can.
I do recommend though, stay away from cheap ones.
(Just my own personal opinion ).