I can't speak for all but i will say that painting the the predator is a very very time consuming piece i never used a brush on my body suit it was all done with an airbrush.
My first attempt was using regular latex paints it looked great but once i put the suit on the paint started to crack and chip off.
The next paint job i gave it i used FW acrylic inks much better stuff.
Following the advice of more experienced airbrush artists, i plan on using the FW inks thinned out with rubber cement it bonds to the latex allot better. as far as the spots there is no way around it other than getting down with airbrush and knocking them out. I was given a bit of advice take a cigarette
and burn some different size holes into a sheet of paper to use as a stencil it sounded like a good idea and i tried it out they came out great i will be using that method on my next go around.
I hope i have given ya somethign to start with, just keep in mind there is no wrong way to paint the predator ....hmmmm well ok no polka dots or bright pinks but after that anything goes.
Peace
Andrew