How to patch and seal cracks in an asphalt driveway

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Introduction

Have you spotted thin cracks or small gaps spreading across your blacktop? Asphalt driveways are tough, but over time, weather and heavy traffic cause cracks that can quickly worsen if left untreated. Learning how to patch and seal cracks in an asphalt driveway is an essential skill for keeping your driveway smooth, safe, and long-lasting. In this guide, you’ll learn how to clean, patch, and seal your driveway like a pro—all with simple tools and materials you can buy at your local hardware store.

Why Patching and Sealing Matters for Your Driveway

Cracks might seem harmless at first, but they allow water to seep into the asphalt base. When temperatures change, that water freezes and expands, creating larger cracks and potholes. Here’s why patching and sealing are important:

  • Prevents further damage – Sealed cracks stop water from penetrating and weakening the base.
  • Extends driveway life – Regular maintenance can add 5–10 years to your asphalt driveway.
  • Improves appearance – Filling cracks and applying sealer restores the deep black look.
  • Saves money – Small DIY repairs cost a fraction of resurfacing or replacing the driveway.

By maintaining cracks early, you avoid costly repairs later.

Step-by-Step Guide to Patching and Sealing Cracks

1. Gather the Right Tools and Materials

You’ll need:

  • Stiff wire brush or screwdriver
  • Shop vacuum or broom
  • Cold-pour crack filler (for small cracks)
  • Asphalt patch (for larger cracks or small holes)
  • Putty knife or trowel
  • Driveway sealer (liquid sealer or asphalt emulsion)
  • Squeegee or long-handled brush
  • Protective gloves, goggles, and work clothes

2. Clean the Cracks Thoroughly

Start by removing all dirt, debris, weeds, and loose asphalt from the cracks. Use a wire brush or screwdriver to loosen particles, then sweep or vacuum the area clean. Proper cleaning ensures fillers adhere correctly.

3. Wash and Dry the Driveway

Rinse the surface with a hose or pressure washer to remove dust and oils. Let it dry completely—moisture prevents filler from bonding. For oil stains, use a degreaser before patching.

4. Apply Crack Filler

  • For small cracks (less than ½ inch wide): Use cold-pour crack filler. Cut the tip of the bottle at a 45-degree angle and apply directly into the crack, slightly overfilling. Smooth with a putty knife.
  • For larger cracks or shallow holes: Use asphalt patching compound. Spread it into the crack with a trowel and tamp firmly to compact.

5. Smooth and Level the Surface

Once filled, level the repaired area with your putty knife or trowel. The surface should be even with the rest of the driveway to prevent bumps.

6. Allow Repairs to Cure

Let the filler or patch cure according to manufacturer’s instructions (usually 24–48 hours). Avoid driving or parking on the repaired sections until fully set.

7. Apply Driveway Sealer

After the cracks are patched and dry, apply a coat of driveway sealer to the entire surface:

  1. Stir or shake the sealer well.
  2. Pour a small amount onto the driveway.
  3. Spread evenly with a squeegee or brush, working in thin, overlapping coats.
  4. Cover the entire driveway, not just repaired spots, for a uniform finish.

Sealing protects your asphalt from water, oil, and UV damage while giving it a fresh, black appearance.

8. Let the Sealer Cure

Allow the driveway to cure for at least 24–48 hours before walking or driving on it. Check weather forecasts to ensure no rain during the curing period.

Common Mistakes to Avoid

  1. Filling Cracks Without Cleaning
    Mistake: Pouring filler into dirty or wet cracks.
    Solution: Always clean and dry thoroughly before patching.
  2. Using Concrete Products on Asphalt
    Mistake: Applying concrete caulk or filler on asphalt.
    Solution: Only use products specifically designed for asphalt driveways.
  3. Applying Sealer Too Thick
    Mistake: Laying on heavy coats of sealer.
    Solution: Apply thin, even layers for proper drying.
  4. Ignoring Weather Conditions
    Mistake: Sealing in extreme heat, cold, or rain.
    Solution: Apply in mild, dry weather (50–90°F).
  5. Not Sealing After Patching
    Mistake: Leaving patched cracks exposed.
    Solution: Always follow repairs with a sealer for long-term protection.

Extra Driveway Tips & Hacks

  • Do Repairs in Spring or Summer: Warm weather helps fillers and sealers cure properly.
  • Use a Leaf Blower: Great for quickly clearing dirt and debris from cracks.
  • Seal Every 2–3 Years: Routine sealing extends driveway life and keeps it looking new.
  • Mark Edges with Tape: Protect sidewalks, garage edges, and landscaping by taping off before sealing.

For related care, check out our guide on how to repair potholes in an asphalt driveway—perfect for handling bigger damage before sealing.

Conclusion

Learning how to patch and seal cracks in an asphalt driveway is one of the best ways to protect your investment and boost curb appeal. With the right tools, a clean surface, quality filler, and a fresh layer of sealer, your driveway will look great and last for years.

Final Tip: Don’t wait until cracks become potholes. Address them early, seal regularly, and enjoy a smooth, safe driveway for the long term. Bookmark this guide to keep your asphalt in top condition year-round.