Sealcoating provides a protective barrier for the surface of your asphalt. It stops water from penetrating the surface, protects from the sun's ultraviolet rays (oxidation), resists oil, gas and salt, and provides an aesthetically pleasing surface. Sealcoat is a mixture of oil, water, and slate. When applied, the water evaporates leaving the oil and slate as the new wear surface. When covered with a dark black sealant, pavement looks and wears like new. Sealcoating projects a positive image of the company, facility, or residential complex.
Sealcoating services can save real dollars for pavement owners. Unsealed pavements will require repairs starting within the second year and could require a one-inch overlay as often as every seven years. Cost savings will be a substantial 65% if the pavement is maintained regularly. Estimated savings for a 10,000-square yard asphalt pavement are $127,000 over 15 years." - National Pavement Contractors Association
If you are planning on owning your asphalt for a long time then it is an easy choice to go with a sealcoating service. The savings alone are a big enough benefit. Then you don't have the inconvenience of having to get your parking lot or driveway repaved. The down time for most businesses would be more than the cost of the sealcoat alone. You also want to make sure you are getting top of the line sealcoat when you are applying it to your surface.