I done it all by freehand , no masking , just had the painting guide beside me , i sprayed down the green first then the grey , i left the pressure around 15-20 psi and thinned the green paint to a ratio of 3:1 and used the smallest needle and tip in my airbrush , i held the airbrush probly around 1 cm from the plane and angled the airbrush so it wouldn't blow over the grey paint , when painting i was only slightly pulling back on the needle to get a tiny amount of paint coming out , gota be careful to not clog the tip and get splatter .
I was using the AK real colours with tamiya retarder lacquer thinner with a paasche talon airbrush . The part number for the airbrush is on the box if u wana have a detailed look at it .