How did this guy get this great paint job?

I understand exactly what he did up until the point of step 3. After he has basically substituted the the wash for a red-black paint mixture and sprayed it into the recesses where the wash would normally flow, he then misted the tank lightly with a desert sand color. The picture basically shows this this as you can clearly see the recesses have been hit with the red-black and the green on the tank looks a bit yellower. Then all of a sudden in the next picture the tank is completely washed out looking.l know he also used Tamiya “buff”, could he have misted the tank with the buff to possibly get this effect?

Here is the tank I;m talking about:
http://www.missing-lynx.com/articles/german/jbpaint/jbpaint.htm

I mix Tamiya Buff with about 80-85% thinner and brush it on with a wide flat brush. I’ve tried misting Buff with the airbrush but had better success with a paintbrush.

That’s usually called a “blend coat”. It can be very light or quite heavy as in his work. A true blend coat normally darkens base coats rather than lightens though. You might get more answers if you post this in the paint forum.

I mist buff with the airbrush for a similiar, but not as drastic effect. Using buff lightens everything

don’t forget about the color filters and all the pastels chalky fun