Paint thinning

You can thin Tamiya either with their own thinner or with lacquer thinner. It's an acrylic-lacquer hybrid paint. Some people thin it with isoprpyl alcohol, but that gives it a grainy texture, in my opinion. Lacquer thinner is best for the gloss colors.

Yes, I use about 30-40% thinner to 60-70%  paint with the regulator set 10-15 psi.

Even Testors paints (acrylics and enamels)  need to be thinned.