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Ron I would sagest you leave what you have there are mix some plaster in with the pigments and then mix in some thinner, I use humbrols. then force the mud in the recesses. once dry finger rub of the excess dirt. Then mount the tracks and mask the areas where you don't want mud to go. Once that is done flick with a stiff brush your mixture on the tracks and wheels.
I also mix real dirt into my pigments to add texture the more real dirt the heavier the texture.