Apart from giving your driveway or parking lot a smooth, maintained, black in color appearance that is attractive and communicates to neighbors and customers that you take pride in your property, it also seals your surfaces to prevent water, petroleum spills and harmful elements, such as salt, from deteriorating the look and function of your asphalt. Repairing cracks in the asphalt FIRST takes this a step further by strengthening the bottom layer of your asphalt surface, thereby, preventing deeper water penetration and giving the top sealcoating layer the ability to protect your surfaces longer.