Asphalt sealcoating is a preventative treatment intended to ensure maximum asphalt pavement longevity. Asphalt crack filler is used to seal any cracks or potholes that are beginning to form, then a liquid seal coating solution is sprayed over the repaired surface of your asphalt parking lot or driveway. The sealer helps waterproof asphalt surfaces, slows oxidation and makes asphalt paving more resilient to other potentially damaging fluids, like gas or motor oil.