we have a local indoor track here in Melbourne, which is based on concrete, then painted with tar asphalt paint, very similar to asphalt traction..very consistent, and not too expensive to apply. has a kind of abrasive finish to it.
Another track over here is painted with this finish (outdoors), and has lasted years!.
2 coats are required for the best result, and fill in the joins in the concrete to get a totally smooth surface.