Having some time this afternoon, I've tried the AK Real Colors.
Here are the paints I will use for my Yak. I started with the PC319 Interior Steel Gray.
I diluted the paint with AK thinner for real Colors at a rate of 50/50 and airbrushed with my Evolution.
...Well guys, it was a real pleasure!!!
Paint is very nice, comes homogeneously, no "blotches", thin, fast drying and the airbrush wasn't obturated by the paint at all.
For a first try, I'm really happy.
...The only thing is that I 've forgotten to paint the canopy frame
Mistake will be corrected soon