Check all product labels for safety instructions before you begin. Gloves, work clothing, and protective eyewear are all recommended. If you have single cracks less than ¼" (6mm) wide, use asphalt crack filler. Check the label for application instructions or apply as follows:  Shake the bottle to mix the product evenly. Cut off the top of the nozzle so the opening is narrower than the crack. (If there is no nozzle, load the product into an asphalt caulk gun instead.) Squeeze the filler directly into the crack until it is flush with the driveway. Let dry for 24 hours. If the filler has sunk below the driveway surface level, apply an additional coat. Wait at least 24 hours after the final coat before walking or driving over the repair. This material is intended for "alligator scale" or "spiderweb" crack patterns, single cracks wider than ¼" (6mm), and small depressions shallower than 2" (5cm). If the alligator cracks are severe, chunks of the asphalt may be fully separated from the driveway. You may achieve a stronger repair if you remove these entirely, then refill the hole using the pothole method above. Pour a little of the material onto the center of the damage. Spread it out with an asphalt squeegee (or an asphalt brush) until the damage is covered with ⅛ to ¼" (3 to 6 mm) of material. Check the label instructions first. Some products may need to be mixed in a bucket before application. Spread on additional alligator patching material until the cracked area or depression is level with its surroundings. For a more even transition, squeegee out a thin layer one or two feet (0.3 to 0.6m) in each direction. The material will harden over the course of a few hours, depending on climate and depth of the repair. Thick repairs may crack slightly over the course of a few days. Apply an additional thin coat if this happens.

Summary:
Follow safety instructions. Fill small cracks with asphalt crack filler. Buy alligator asphalt patch for more serious cracks. Spread the alligator patching material with an asphalt squeegee. Repeat until level. Let dry. Repeat if needed. Allow 24 hours for the blacktop to dry and cure before parking or walking on the driveway.