having a little knowledge about asphalt from previous experience, the type of asphalt you choose to use isn't really going to be an issue. pretty much any type aside from porous asphalt should give you a good smoothe consistant surface. having an asphalt "strong" enough also shouldn't be an issue if you plan on using this surface for RC cars only. RC cars won't weigh anywhere near enough to damage the asphalt, obviously.
the most important things are to make sure you have a good base to prevent as much cracking as possible. the next is what type of sealer you are going to use. this will ultimately be what affects traction and the overall "feel" of the track.
you will basically always have small cracks as the asphalt cures and reacts to temperature and moisture changes throughout its first year. it usually takes almost a full year for new asphalt to fully cure. this doesn't mean you can't use it after several days, but that you will notice change in color and notice tiny cracks, which are normal, appear as it goes through the entire curing process.
it's often recommended to leave it unsealed for the first year, or at very least 6 months so that it can fully cure. if you seal it right away, it'll never cure properly and it'll decrease it's life.
if you lay down a good base, the paving company uses the right mixture and you allow the pavement to cure before sealing, you'll be golden.
once it's time to seal the asphalt, that's when you have a big decision to make and hopefully those that have built/run RC tracks can chime in with the best sealer for RC racing use.