Driveway Sealing and Maintenance: When to Seal, What It Costs, and How to Make Concrete and Asphalt Last

Seal an asphalt driveway every 2 to 3 years and a concrete driveway every 3 to 5 years, and reseal when water stops beading on the surface or the colour has faded to grey — a driveway that absorbs water instead of shedding it is already taking damage. Sealing costs $0.15 to $0.35 per sq ft for asphalt and $0.50 to $1.00 per sq ft for concrete, so a standard 600 sq ft two-car driveway runs $150 to $300 for asphalt or $300 to $600 for concrete professionally, and about half that DIY. Before sealing, price a replacement honestly with the concrete driveway cost guide and the Concrete Calculator: sealing a driveway with structural cracks or a failed base is money wasted, while sealing a sound driveway at the right interval can double its life. Our concrete pouring guide explains the base and curing mistakes that decide whether a driveway lasts, and our winter checklist covers the freeze-thaw care that matters most in cold climates.

Asphalt vs concrete: different surfaces, different maintenance

Asphalt is flexible, which helps it survive freeze-thaw cycles, but it oxidises in sun and air, turning grey, brittle and porous within 2 to 3 years of installation. Sealcoat — a coal-tar or asphalt-emulsion coating — replaces the lost binders, restores the black colour, and waterproofs the surface, which is why the 2 to 3 year reseal interval is not upselling but the actual service life of the coating. A well-sealed asphalt driveway lasts 20 to 30 years; an unsealed one in a freeze-thaw climate often needs resurfacing in 12 to 15 years, at $2 to $5 per sq ft against $0.15 to $0.35 for sealcoat.

Concrete does not oxidise, but it is porous and it cracks. A penetrating silane or siloxane sealer, at $0.50 to $1.00 per sq ft applied, soaks into the surface and blocks water and de-icing salts without changing the look, while a film-forming acrylic sealer adds a sheen and better stain resistance but wears faster under tyres and can peel if moisture is trapped beneath it. Concrete sealing intervals run 3 to 5 years, shorter where de-icing salts are heavy or the driveway sees oil drips. The test for both surfaces is the same: sprinkle water on the driveway. If it beads and rolls off, the sealer is working. If it soaks in and darkens the surface, the sealer has worn through and it is time to reseal.

When to seal, and when sealing is the wrong call

Seal new asphalt only after it has cured — 90 days minimum, ideally 6 to 12 months, because sealcoat over uncured asphalt traps oils and can peel. Seal new concrete after 28 days of curing, once the surface is fully dry. The best sealing weather is 50 to 90°F (10 to 32°C) with no rain for 24 to 48 hours after application and no heavy traffic for 24 hours, which makes late spring and early autumn the ideal windows in most climates. Sealing in summer heat is fine if the surface is not above 95°F, but avoid sealing under trees dropping sap or seed in spring, since debris embeds in the wet coating.

Do not seal a driveway that needs structural repair first. Cracks wider than 1/4 in, sunken or heaved slabs, alligator cracking across an asphalt area, or a base that pumps water under load are structural problems that sealcoat hides for one season and then fails with. Fill cracks under 1/4 in with crack filler before sealing, patch potholes properly with compacted patch material rather than a surface skim, and level sunken concrete slabs by mudjacking ($300 to $700 per slab) or foam injection before sealing. If more than 30 percent of an asphalt driveway is alligator-cracked, resurfacing or replacement beats another round of sealcoat, and the replacement cost guide linked above will tell you which side of that line your driveway sits on.

The DIY sealing job, step by step

A DIY sealcoat job for a 600 sq ft driveway takes one dry weekend day and about $80 to $150 in materials for asphalt, $150 to $300 for concrete sealer. Start by cleaning thoroughly: sweep, blow off dust, scrub oil stains with a degreaser, and pressure-wash the whole surface, then let it dry fully — sealer over a damp surface bonds poorly and can whiten. Fill cracks with pourable crack filler for narrow cracks or a trowel-grade filler for wider ones, and let the filler cure per the label, usually 24 hours. Edge the driveway with tape or a brush cut-in along grass, pavers and garage thresholds, because sealcoat stains anything it touches.

Apply in two thin coats, not one thick coat. Pour a ribbon of sealcoat across the width, spread it with a squeegee or a wide brush, and work in sections so the wet edge stays workable. Two thin coats at right angles to each other last longer than one heavy coat, which can crack as it dries. Keep traffic off for 24 hours and avoid parking heavy vehicles for 48 hours. The most common DIY failure is sealing over a dirty or damp surface, followed by applying too thick a coat that skins over while wet underneath — both show up as peeling within the first winter. If the driveway has never been sealed and is heavily oxidised, a primer coat or a second full coat is worth the extra bucket.

Year-round maintenance that costs almost nothing

Sealing is only one part of driveway life. Clean oil and fluid drips promptly — oil softens asphalt binders and stains concrete permanently if left for months — and use kitty litter or a degreaser on fresh spills. Keep grass and weeds out of joints and cracks, because roots widen cracks and hold moisture against the edge. In winter, use calcium magnesium acetate or sand for traction rather than rock salt on concrete less than a year old, since de-icing salts attack young concrete and accelerate scaling; on older concrete, salt is acceptable but should be rinsed off in spring. Never use a metal shovel blade aggressively on a sealed surface — a plastic blade or a snow blower set slightly above the surface preserves the coating.

Drainage decides driveway life more than sealing does. Water standing on a driveway in a low spot, or running off a roof valley straight onto the slab, will defeat any sealer. Regrade the edges so water sheets off to lawn or drain, keep gutters and downspouts discharging at least 4 ft from the driveway edge, and fix any spot where water ponds for more than 48 hours after rain. Edge restraint matters too: asphalt and paver driveways spread at the edges without a solid border, so keep the edge supported by soil, concrete curbing, or paver restraint, and avoid driving heavy vehicles over the unsupported edge, which is how most edge failures start.

Budgeting the lifetime cost

Over 25 years, a 600 sq ft asphalt driveway costs roughly $4,000 to $8,000 to install, plus 8 to 10 sealcoat rounds at $150 to $300 each, plus crack filling every few years — a lifetime total near $6,000 to $11,000. A concrete driveway costs $6,000 to $12,000 to install, plus 5 to 7 sealer rounds at $300 to $600, for a lifetime total near $8,000 to $15,000, but with less frequent attention and a longer surface life. Those totals assume the base was built right: a driveway on a poorly compacted base fails regardless of sealing, which is why the cheapest installation quote is often the most expensive driveway. When comparing quotes, ask for the base specification — 4 to 6 in of compacted gravel for concrete, 6 to 8 in for asphalt under passenger cars — because that layer, invisible once poured, decides whether sealing is maintenance or life support.