For my roads I use 0.125" Masonite. I paint them a random flat black and then top coat with a Woodland Scenics blend of their blacktop and concrete paint in a random pattern. Finally I sand them a little with a 120 sanding block.
For my sidewalks I use a Bar Mills product. I glue the sidewalk to another 0.125" strip of Masonite which provides the proper sidewalk height. The Bar Mills product is a compressed paper product that cuts easily and is embossed with cracks and curbing. I paint the sidewalks and parking lots with a base coat of a "concrete" looking paint. After that dries I paint a random pattern of Woodland Scenics concrete paint that I thin down with water over everything. Then using an old t-shirt, I wipe" it off in a random pattern.
This might all sound a little tedious but it goes quickly.
Donald
