Materials available for asphalt driveway maintenance include emulsified liquids, plastic fillers and solid cold-patches. For a complete driveway rejuvenation, you may need all three. Before tackling any maintenance or repair, check your driveway for these conditions:

• Impressions left by car tires after the car has been parked on the drive overnight. This is an indication of poor construction.
• Heaving or tilting during cold weather, or buckling or cracking with the spring thaw. These are signs of poor drainage.

To repair these troubles, you'll need a new driveway. Fortunately, such problems are not common. More likely problems are minor cracks, crumbling and chuckholes, which are relatively easy to repair. The procedure and materials used depends on whether you're repairing cracks, filling low spots, patching or seal-coating your driveway. Your local retailer can help you select the products you need for making repairs.

You should fill any cracks in a blacktop drive as soon as possible to keep water from getting under the slab and causing more serious problems. Cracks that are 1/2" and wider are filled with asphalt cold-patch, sold in bags and cans. Narrow cracks are treated with crack-filler, which is available in cans, plastic pour bottles and handy caulking cartridges.

Use a masonry chisel, wire brush or similar tool to dig away chunks of loose and broken material from the crack.

Sweep out the crack with a stiff-bristled broom. Your shop vacuum will also work well.

Use a garden hose with a pressure nozzle to clean off all dust. If the area is badly soiled or covered with oil or grease drippings, scrub it with a strong commercial driveway cleaning agent. For a patch to adhere, the crack must be free of all such things. After using a cleaner, rinse the area with water.

For a deep crack, fill it to within 1/4" of the top with closed-cell plastic backer rod or sand before applying a patching compound.