How to Seal Coat Asphalt

Sealcoating asphalt extends a surface's lifespan and improves its overall appearance. Apply a sealcoat to asphalt once a year to protect the surface from the elements. Water that freezes and melts on asphalt causes the asphalt to contract and expand, thereby causing cracks to form. Applying a sealcoat to asphalt will protect the surface from such damage. Furthermore, the sealcoat will protect the asphalt from fading and drying out from the sun. Taking the time to sealcoat asphalt yearly will prevent and protect the asphalt from problems down the line.

Step 1

Repair any existing cracks in the asphalt that are larger than 1/4 inch in width with a cold-mix asphalt patch. Fill the hole with the patch until it is overflowing. Smooth out the patch with a trowel or putty knife. Allow the repaired area to dry completely. Smaller holes will be filled in by the sealer. Pull up any weeds that may be poking through the surface of the asphalt.

Step 2

Sweep the asphalt surface with a push broom to remove loose dirt and debris. Hose down the surface with a garden hose. Scrub any oil or grease spots with a scrub brush and detergent. Rinse the surface well of any soap. Allow the asphalt to dry completely.

Step 3

Mix the can of seal coating. Turn the can upside down and allow it to sit like that for a few minutes. This will allow the seal coating to settle properly. Turn the can back upright and mix thoroughly with a paint stirrer.

Step 4

Pour a generous amount of sealer directly onto the asphalt--enough to cover about a 20-square foot section at one time. Begin working at the back of the surface.

Step 5

Spread the sealcoat onto the asphalt surface using a paint roller. Attach the roller to a long handle so that you can work while standing up. Overlap your strokes with the roller, ensuring that the sealer is not applied too thick. A thin coat is all that is needed.

Step 6

Allow the asphalt to dry for at least 24 hours. Ideally, try to stay off of the asphalt for 48 hours to allow it to dry completely.