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check out woodland scenics they do something that may help.their is a tutorial how to use it but on a larger area than a base,but it may help.
Welcome to Woodland Scenics! Home of everything for Model Railroad Scenery!
Asphalt, try to get a hold on the dark blue/black sand used for miniature trains scenes, the very fine one. Alternatively, there are premade sheets of asphalt roads for the railroad sets too. maybe you can use those. i'll see if i can find a brand that makes them.