Equally important is to ensure that the proper sealing process is used if you do indeed intend to seal your driveway.  This is yet another case were talking with your asphalt company is recommended to ensure that the right type of sealing product is used.  Better yet, simply have your asphalt company do the sealing work for you to ensure that it is done correctly.  In addition, making good use of downspouts can help to reduce the chances of water damage to a driveway.