Crack sealing is a method in which hot sealant is applied to cracks in asphalt to protect from water penetration. Sealcoating is a protective layer over the entire surface area which keeps out damaging UV rays, harsh chemicals and water. Depending on the condition of the asphalt, both methods may be used to protect the asphalt. Consult with a knowledgeable ACI representative to determine what course of action is best for your property.