How to Repair Asphalt Driveway Cracks | HowStuffWorks
To fill smaller cracks you should use rubberized asphalt-emulsion crack filler. Try to avoid getting any of the filler on unaffected areas as it can stain the driveway. Apply the filler using a caulking gun if available. If you don't have a caulking gun, the filler can be poured carefully into the crack.