How to Seal a Driveway

A fresh coat of driveway sealer locks out water, UV, and road salt — the three things that turn small cracks into crumbling potholes. Skip it and you’re looking at a $5,000–$10,000 resurfacing job years too early; do it right every 2–3 years and your driveway can last decades.

What you’ll need

• Driveway sealer — asphalt/blacktop sealer for asphalt drives; use a concrete sealer for concrete (2 coats typically cover 400–500 sq ft per 5-gallon pail)
• Crack and pothole filler — cold-patch or trowel-grade filler for anything wider than a pencil
• Application squeegee and brush — a driveway squeegee-brush combo spreads sealer fast and even
• A stiff brush — for cutting in edges, borders, and tight spots
• A pressure washer — the fastest way to get a truly clean, bondable surface
• A stiff push broom — to clear dirt, sand, and debris before and after washing
• Degreaser or driveway cleaner — oil and grease must come off or sealer won’t stick
• Weed killer — to kill anything growing in the cracks first
• Masking tape — to protect the garage apron, walkways, and lawn edges
• A scraper or putty knife — to dig debris out of cracks
• Disposable gloves and old clothes — sealer does not wash out
• A garden hose — for rinsing and cleanup

Step 1: Pick your weather window

This is the single most important decision, and it happens before you buy anything. You need at least 24 hours — ideally 48 — of dry weather with daytime temps between 50°F and 90°F and no rain in the forecast. Sealer needs warm, dry air to cure; a surprise shower on a fresh coat will wash it into the gutter and you’ll start over.

Pro tip: Late spring and early fall are ideal — you avoid both the peak-summer heat that flash-dries sealer before it can level and the cold nights that stop it curing. Seal in the morning so the coat has full daylight to set.

Step 2: Clean the surface completely

Sealer bonds to clean pavement, not to dirt. Start by pulling or killing weeds in the cracks with a weed killer, then sweep the whole driveway with a stiff push broom. Hit oil and grease stains — the spots under where you park — with a degreaser and scrub them in; petroleum residue is the number-one reason sealer peels.

Then pressure wash the entire surface. A pressure washer from DeWalt or Ryobi blasts out embedded grit and lifts loose material far better than a hose. Rinse toward the street and let the driveway dry fully — sealing over damp pavement is a guaranteed failure.

Step 3: Fill cracks and patch holes

Dig loose crumbs out of every crack with a scraper or a screwdriver, then blow or sweep them clean. Fill hairline cracks and anything up to about half an inch with a pourable crack filler; for potholes and crumbled edges, pack in cold-patch, tamp it down firm, and let it set. Rust-Oleum and other trusted brands make both. Everything you patch needs to cure per the label — often a few hours to overnight — before sealer goes on top.

Common mistake: Sealer is a coating, not a filler. Trying to bridge a wide crack with sealer alone leaves a thin skin that splits open by the next freeze. Fill first, always.

Step 4: Mask and prep the edges

Run masking tape along the garage apron, any concrete walkways, and where the driveway meets the lawn or flower beds. Sealer splashes and it stains everything it touches, so take five minutes now to save an hour of scrubbing later. Stir the sealer thoroughly with a paint stick or drill mixer — the good stuff settles heavy in the pail and needs to be fully blended before the first pour.

Step 5: Apply the first coat

Start at the garage end so you seal your way toward the street and never trap yourself. “Cut in” the edges and borders first with a stiff brush, then pour a ribbon of sealer across the driveway and spread it in a thin, even layer with your squeegee, working in small sections and always pulling in the same direction. Wear gloves — sealer does not come off skin easily.

Thin is the goal. Two thin coats always outperform one thick one: a heavy coat skins over on top, stays gummy underneath, and cracks. If the surface looks streaky, that’s fine — the second coat evens it out.

Step 6: Second coat, then cure

Let the first coat dry per the label — usually 4 to 8 hours until it’s no longer tacky — then apply the second coat at a right angle to the first for full, even coverage. Pull your tape while the sealer is still slightly wet for the cleanest line.

Now stay off it. Keep foot traffic off for at least 24 hours and cars off for 24 to 48 hours; the longer you wait before parking, the harder the finish sets. A quick rinse with a garden hose cleans your tools while the sealer is fresh.

Frequently asked questions

Sealing a driveway is a genuinely beginner-friendly job — the hard part is patience with prep and weather, not skill. If you’re not sure whether your driveway is asphalt or concrete, or you need the right sealer and a squeegee before the weekend, your local independent hardware store can match you up in five minutes. Got a question about your specific driveway? Ask us here — we’re glad to help.