John: This is the first time I have ever thinned Mig or Vallejo airbrush paints. Since I wanted to get the preshading to show through, I thinned each RLM color with Mig acrylic thinner- about 60% paint/40% thinner - plus a couple of drops of Taimya retarder, mixed directly in the airbrush cup. Worked like a champ!
I just sprayed the whole thing with Future and in a few days will finish off the camo.