I use the Vallejo powders as they are nice and fine and when mixed with some mat varnish they dry to a nice flat dusty look. just give it a quick pass or two and you get a nice heavy dust. Give is a more concentrated blast and you can build it up into a nice thick layer.I actually tried to make it look more dirty than muddy, since Monte Carlo is primarily a road / tarmac event, but there's still plenty of muck thrown up.
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