How to Seal an Asphalt Driveway

Seal your asphalt driveway correctly and it could last up to 30 years.

Step 1: Driveway preparation

An asphalt driveway can last almost 30 years. But you can't achieve that long life span unless the driveway was installed properly and you perform regular maintenance, like filling cracks annually and applying sealer when needed.

Preparation can take a full day (including drying time), and it's tedious. The application phase is much faster, taking only a few hours per coat for a typical driveway. Most sealer manufacturers recommend two coats with a minimum drying time of eight hours between coats, so this project will fill an entire weekend.

The materials cost about $100, but you'll save about $200 in labor over a professional job. A power washer speeds the cleaning process, but you can do the job without it. In addition to a squeegee or application brush, you'll need a broom, drill, mixing paddle, duct tape, dashing brush and poly sheeting to protect painted surfaces.

Avoid these common driveway-sealing mistakes

  • Depending on the sealer to fill cracks. It won’t. Fill them properly before applying sealer.
  • Failure to clean and prep the driveway before applying the sealer. If you don’t want to spend time cleaning the driveway, you may as well skip the sealer too, because it won’t stick to a dirty driveway.
  • Failure to stir properly. Don’t depend on a stir stick. It simply won’t blend the water and solids enough to get a consistent mixture.
  • Use of the wrong applicator. Using a brush when the manufacturer specifies a squeegee (or vice versa) will cause premature sealer failure.
  • Applying sealer too often. Too much sealer will flake off. Wait until you begin to see asphalt aggregate before you apply a new coat of sealer.

Step 2: Buying the right materials

Driveway sealer is available in various grades and price ranges, from as little as $15 per 5-gallon pail to about $35 per pail for a premium product. Some bargain products contain almost 50 percent water and have lower coverage rates and a correspondingly shorter guarantee, so they're not the most cost-effective solution over the long term. Use one of them if you're trying to spiff up the driveway before selling your home. Premium products, on the other hand, are made with higher quality resins and UV stabilizers and contain filler and elastomeric material, so they last longer and carry a longer guarantee.

Manufacturers also make different formulas for different driveway conditions: one formula for newer driveways in good condition and another formula for older driveways that haven’t been well maintained. The two formulas also vary in their coverage, so read the labels carefully and choose the correct sealer and quantity for your particular driveway. Follow the manufacturer's directions for the type of applicator to use (brush or squeegee). Using the wrong one can cause premature failure. You'll also need liquid driveway cleaner/degreaser to remove oil and tree sap. If your driveway has visible oil stains, pick up a bottle of oil spot primer.

Step 3: Check the weather before you start

You'll need at least two days of dry weather to seal your driveway. Temperatures must be above 50 degrees F during application and throughout the night. And, it's best to avoid scorching-hot sunny days (the sealer may dry too fast). If you ignore the weather forecast, you may see $100 worth of sealer wash away in a heavy rain.

Step 4: Start with cleaning and priming

Even if you think your driveway is clean, trust us, it isn't. Exhaust gas contains combustion byproducts that deposit a light, sometimes oily film on your driveway. That film, along with dirt and tree sap, must come off if you want the sealer to stick. So clean the driveway first (Photo 1).

Next, rinse the driveway with clear water (Photo 2). Let the driveway dry completely before applying the sealer. Then perform a final sweep with a push broom. Treat any oil stains with an oil spot primer (Photo 3).

Step 5: Mask, stir, and trim

Driveway sealer will splash onto your garage door and sidewalks as you pour it. And it'll get all over your shoes and clothes. It's very difficult (often impossible) to remove later, so wear old work clothes and shoes. Mask the garage door with poly sheeting and apply strips of duct tape to concrete walks where it butts up to the asphalt.

Choose an area on the driveway for mixing and cover it with poly sheeting to protect against spills (dried spills will show through the sealer). Remove the pail lids and cut a small hole in the center of one lid. Use that lid to prevent splashing during mixing. Stir until the mixture is smooth (Photo 4). Next, cut in all four edges of the driveway with a large dashing brush (Photo 5). Clean the brush with soap and water as soon as you’re done cutting in the edges—you'll need it again the following day. Then stage the pails equally down the driveway (Photo 6).

Step 6: Pour and spread

Pour the sealer onto the driveway (Photo 7). Then spread the puddle with a squeegee or broom, depending on the manufacturer’s directions (Photo 8). Pour enough sealer to maintain a puddle in front of the applicator tool.

When you reach the bottom of the driveway, cap the remaining pails and clean the squeegee or brush. Set the empty pails along the curb to prevent cars from ruining the job. Then let the sealer dry overnight.

Repeat the sealer application the next day. Let the sealer dry for 48 hours before driving on it (better safe than sorry). Don’t ask how we learned that lesson.

Driveway sealers: Real protection or just black paint?

Some asphalt driveway companies tell their customers that driveway sealer is a waste of money, that it's cosmetic and doesn't do anything to extend the life of the asphalt.

It's true that driveway sealer can't replace the liquid asphalt (oil/tar) that oxidizes and bakes out of the mixture from heat and sun exposure. But a high quality sealer can dramatically reduce future heat and UV damage. Plus, it seals the pores to prevent aggregate breakup damage caused by water penetration, freeze/thaw cycles and chemicals. So it really does extend the life of your driveway.

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