I have mentioned how much I hate mottling? I mean really hate mottling?
Soley because I stink at it. I just haven't hit that magic combination of airbrush pressure and paint-to-thinner ratio.
I shot the mottle tonight and I'm almost positive I invented a few new words to place in the foul-mouth lexicon. 5 psi and 3:1 thinner/paint ratio? Still get spidering. Add a little paint. Now the dang pressures too low. Adjust pressure. Hmm, not bad, wait, stop spattering! Aaaggghhh! Write down new words for verification by whatever governing body governs cuss words. Adjust pressure, try again. Clean clogged tip. Try again. And so on, so on. The only thing that saved me at all was deciding to cut random size masks from index cards. That alone helped mitigate the damage.
Tomorrow? Touchup all the bad spots. That'll be another full night.
How those other guys do it, I don't know. I'm still waiting for my mottling muse.