Besides the obvious black color, your asphalt finish may appear smoother in some areas than others. Some of these variations are caused by the physical make-up of asphalt itself (different sized stones, amount of sand and liquid asphalt, etc.) while other variations are caused by using hand tools rather than machinery in some areas. The durability of your asphalt is in no way negatively affected by these variations, but you may notice them. It is not helpful to kick at or attempt to scuff or loosen these areas before they have had the chance to cure.