Asphalt sealers are protective coatings applied to asphalt surfaces, such as driveways and parking lots. They help to extend the life of the asphalt by preventing damage from water, UV rays, and chemicals. Sealers can also improve the appearance of the surface, giving it a fresh, black finish. There are different types of asphalt sealers, including coal tar and asphalt emulsion sealers. Coal tar sealers are known for their durability and resistance to oil spills, while asphalt emulsion sealers are more environmentally friendly and easier to apply. Regular sealing can help maintain the integrity of asphalt surfaces over time.