With time your asphalt will change in color and texture. Many factors including weather, sunlight, and traffic slowly alter the appearance and make asphalt more brittle. Seal coating will extend the life of your asphalt, resist gas and oil spills, slow down oxidation and weathering, as well as improve the appearance of the asphalt, and provide slip resistance.
Asphalt should be sealed 1 year after being put in and then every 2 to 3 years after depending on traffic and weather. This will double or even triple the life of your asphalt. Most wait too long to start a maintenance plan on their asphalt resulting in a lot of the damage already being done. Yes, we can do something for it, but the initial damage has been done.