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Sarge, thanks for bringing the post back out. I had forgotten about posting it.
And thanks to all who responded.
Now, when doing a "dusting" do you alter the paint/thinner ratio or the air pressure settings, or both, or neither?
What I realy need is a class on airbrushing. But any I have seen offered had notheing to do with models. 
Hi Charles,
This is what I do for dusting, I use Tamiya Buff (Can't remember the number}, I thin it about 40% paint and 60% thinner. Then adjust my airbrush to spray wider pattern, then limited the paint flow to medium, then spray them from maybe half a foot away to give it a dust feel. And for mud, I use Gunze Sangyo's weathering paint, I don't know if you can get them in the States or not, they are 6 in a blue box thing, with mud, sand, rust, soot, and another 2 color, then I thin the mud paint to about 40/60 also. The airbrush setting is same as I spray buff, but I spray them more close to the model, maybe 4 inch or so. This I do mainly to the substructure, and when I spray to the part that joins with the super-structure, I pull the airbrush a little back, to spray some mud on the superstructure.
I found that Tamiya Flat Earth mixed with flat black (steal that from Greenland's book :-) ) also works well for the mud thing.
