Sealcoating is important because it extends the life of a newer asphalt surface. Trying to sealcoat an old, excessively cracked asphalt surface is not recommended.

Sealcoating is best applied after about two years of laying down the original asphalt. It can be applied by either spray or squeegee, though the spray is often the better method, except in windy conditions. Sealcoating can typically last up to four years, though if the asphalt surface faces large traffic or foot volume, it should be applied every three years.