The best "scale" black is Polly Scale's Tarnished Black. It's a very dark gray color that dries flat. I use it for tires and anything else that needs to be black, but not shadow (i.e. instrument panels are tarnished black, but if I need to black out an area behind an engine, I use tamiya flat black).
You can sorta see it in this picture, where I used it to paint the de-icer boots on the leading edges of the wing and for the waist gunner's center walkway.
You can get it from Megahobby.com, as well as a few other online retailers.
-Fred