Just as you would mow your grass weekly, sealcoating is a routine maintenance service that should be performed on a bi-yearly time frame. If performed properly using a proven/tested product it can extend the life of your asphalt by 75%. Sealcoating provides your asphalt with necessary oils back into the top surface making a barrier to slow the deterioration from the sun, salt, and oil spills. With the constant Minnesota freeze/thaw cycle it is recommended to service your driveway every other year.