OK - Methinks you are over complicating the situation. Go to your local sand and gravel supplier (NOT Home Depot or another one of the big box stores) where you will find they offer several varieties (in both color and size) of washed sand. Pick out one that replicates the area you are modeling. It can be applied using the traditional white glue and "wet" water method. If you have some yard or industrial areas that need a dirtier look just lightly spray those areas with some rattle can black (from WallyMart) held about a foot away from the sand. I paid $4 for an 80Lb. sack. After all what emulates real dirt better than real dirt?
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