My comments here are limited to airbrushing - I rarely, if ever airbrush things like structures and usually paint them by hand.
Years ago my go-to paint for painting locomotives and rolling stock was a line of paint called "Accu-paint" from SMP Industries. (Not to be confused with the Accu Flex line of paints that eventually became "Modelflex").
I got started using Accu-paint since I modeled New England railroads and Accupaint made a line of decals with paints colored to match. But I found I always had great results with the stuff - it sprayed nice and fine, didn't spatter, gum up the airbrush, or dry with anything other than a smooth, shiny finish perfect for decals.
A few months ago I stumbled across a bottle of Tru-Color paint at a train show. I'd heard of this paint but had never actually encountered it. "Oh great, more crappy paint" I said to the owner.
"Try it and see what you think" was his reply.
Last night I sprayed a car with the stuff - the paint performed beautifully, just like the old Accu-Paint (no surprise since they're essentially the same formula).
I've used some acrylic paints - primarily the Vallejo brand - with good success as well. With some brands I always seem to get splattering and other issues.
And no matter what I've tried I always seem to have issues with clear flat finishes from any acrylic paint manufacturer.
I just tried the Tru-Color clear flat finish - it went on like a dream!
Tru-Color has also introduced something Accu-paint never did - a line of flat weathering colors. I'm going to try those once I get through tomorrow's operating session.
I'll post photos later.
And since someone will inevitably post a comment about solvent-vs-acrylic paints and safety issues I'll add common sense applies. When you're airbrushing anything - including acrylics - you should be using a vented booth and ideally wear a two-stage respirator, gloves, and eye protection.