Hi caseyone1.

I've only used my airbrush for clear coat with polyurethane and acrylic lacquer on necks, so I can't speak to w/b enamel. Also being clear, pictures are going to show you much.

What I like about the airbrush (mine is double action also) is doing a maple fretboard, I don't get excessive build up of material at the frets. (damming)
I do have to apply more coats because of the lighter delivery of material, but I feel I have more control than using my full size gravity gun. FWIW, my airbrush will do both gravity or suction.

I should also say I am still very much a novice with using spray gear, but so far my results been an improvement over rattle cans.