Sealcoating is an asphaltic liquid covering used to seal and renew the surface of aging asphalt. It is the most crucial element of a pavement-maintenance plan. Untreated asphalt, or blacktop, will deteriorate quickly and become brittle and less resistant to the loads it must bare.
It is easy to tell if an asphalt surface needs to be seal coated because when the top layer of asphalt bitumen is worn away your surface will turn gray. Over time asphalt pavement will break down from factors like roadway wear, sunlight, heat, and precipitation. Asphalt bitumen is naturally black in color and when the top layer of asphalt is worn down the aggregate rock that makes up asphalt surfaces will show through.
Seal coating protects the asphalt from contaminants such as motor oil or gasoline as well as salt, water, ice and the sun that will stain or eat away at the asphalt surface. Ideally, seal coating is performed when temperatures are above 50 degrees Fahrenheit and not lower than 40 degrees Fahrenheit. It is highly recommended that paved surfaces be resealed every 1 1/2 to 2 years.