Caring for a Newly Sealed or Coated Driveway

Why this matters

A fresh driveway coating looks finished the moment the crew packs up, and it is not. For the next day or two it is a wet film that is still giving up water or solvent, and for the next few weeks it is softer than it will be for the rest of its life. Nearly every complaint about a new coating, footprints in the surface, a gray streak down to the street, tire marks shaped like a fan, sealer tracked across a kitchen floor, comes from that window, not from the product or the application.

The good news is that the window asks very little of you. Mostly it asks you to wait, to keep a few things off the surface, and to look closely enough in the first week that anything genuinely wrong gets reported while the crew can still fix it cheaply.

What is actually happening while it cures

There are two common jobs, and they cure differently.

Asphalt sealcoat. This is the black coating spread over an asphalt (blacktop) driveway, usually a water-based asphalt emulsion, often mixed with sand for grip. It goes on as a liquid with water in it. As the water evaporates, the tiny asphalt particles squeeze together and bond into a film. "Dry to the touch" means the surface water is gone. "Cured" means the film has finished bonding all the way through, and that takes far longer than the surface suggests.

Concrete sealer. On a concrete driveway, a sealer is either a film-forming product (often acrylic, leaving a sheen or a wet look) or a penetrating product that soaks into the concrete and leaves little visible change. Film formers behave much like sealcoat: dry on top first, hard all the way through later. Penetrating sealers usually ask less of you, but they still need the time the crew gives before water and traffic.

What speeds it up and what slows it down. Sun, warmth, low humidity and a breeze all shorten the cure. Shade, cool nights, high humidity, dew and a thick application all lengthen it. That is why the crew may give you different times for the sunny strip by the street and the shaded strip under the tree, and why the same product takes longer in October than in July.

The times the crew gave you are the times that count

The crew's instructions are written for the product they used, at the thickness they applied, on the day they applied it. Those beat anything you read elsewhere, including this card.

As a typical picture only: on a warm, sunny day many asphalt sealcoats are ready for careful foot traffic within several hours to overnight, and for cars somewhere around 24 to 48 hours. Concrete sealers vary even more, from a few hours to a couple of days. Cool, damp or shaded conditions can double any of those. If the crew left a written card, keep it, and if they only said it out loud, write it down with the time they finished.

When in doubt, wait longer. A driveway that sat untouched an extra half day costs you nothing. A driveway driven on six hours early can carry tire prints for its whole life.

What the cure period asks of you

Keep everyone off it. Block both ends of the driveway with the crew's tape, a couple of trash cans or a rope, and park on the street. Tell everyone in the house, and anyone expected: delivery drivers, a dog walker, a neighbor kid who cuts across on a bike. Most footprints in fresh sealcoat belong to somebody who was not told.

Keep pets and children off and away. Wet sealer sticks to paws and shoes and comes into the house. If it gets on skin, wash it off with soap and water. Do not use gasoline, paint thinner or any solvent on skin, and if any gets in an eye, flush it with clean running water for 15 minutes and call Poison Control at 1-800-222-1222 or your doctor. A pet that walked through it needs its paws washed with soap and water, not solvent; call your veterinarian if it licked a lot of it off.

Turn off the sprinklers. Lawn sprinklers that overspray the edge are the most common cause of a streaked new coating. Shut the irrigation off, or at least the zones along the driveway, for as long as the crew says, often 24 to 48 hours. Set a reminder to turn it back on, because the lawn will not wait forever either.

Take shoes off at the door. Even after it looks dry, a fresh coating can still leave a faint dark smudge on carpet or light flooring for a day or two.

Keep things with small feet off it for the first few weeks. A motorcycle kickstand, a trailer jack, a ladder foot, a bike stand or a basketball hoop base can sink into a coating that is dry on top but still soft below, especially on a hot afternoon. Put a square of plywood under anything like that.

Driving on it in the first weeks

Once the crew says cars can go on it, the coating can take normal driving, but it is still at its softest.

Do not turn the wheel while the car is standing still. Turning the steering wheel with the car not moving twists the front tires against the surface. On a hardened driveway that does nothing you can see. On a new coating it grinds a fan-shaped scuff into the surface. Roll forward a little, then turn.

Drive slowly and straight in and out. Sharp turns at speed, and spinning tires on a wet morning, do the same kind of damage.

Expect some marks anyway. Light tire marks where you park, especially in hot weather, are normal on a new sealcoat and usually fade over the first few weeks as the coating hardens and sunlight weathers the surface. A heavy scuff from turning in place may not fully disappear.

Watch for drips. A car that leaks oil or coolant will soften and stain a new asphalt coating. If yours drips, put a drip pan or a piece of cardboard under it for now and get the leak looked at.

Rain: what is normal and what is not

Rain before the coating has set is the one weather event that can genuinely damage it. Rain after it has set is just rain.

Rain after the cure the crew gave you: water beads or sheets off. Nothing to do.

Light rain a few hours after application: you may see a little gray or brown in the first water running off the low edge, and a slightly dull or uneven look where it hit. Often that is cosmetic and settles in.

Heavy rain soon after application: this is wash-off. The water running off is milky gray or brown, and the next morning you may see streaks running downhill, a thin or bare patch at the low end, or a gray film on the sidewalk or the street at the bottom of the driveway. That is worth reporting.

On a film-forming concrete sealer, moisture trapped under a fresh coat can leave a white, cloudy haze, sometimes called blushing. It often fades as the sealer dries out over a few sunny days. If it is still there a week later, report it.

Do not try to fix any of this yourself. Do not scrub, pressure wash or add a store-bought coating over a streak. Those tend to make a small, fixable problem into a large one. Photograph it and call the crew.

What to look for in the first week, and what to report

Walk the driveway once in the first two or three days, in daylight, and once more at about a week.

Normal, and not worth a call:

• A slightly uneven sheen, with sunny areas looking a little different from shaded ones.
• Old oil stains still showing faintly through an asphalt coating. Sealcoat does not hide oil unless the crew primed the spot first.
• Cracks that show through. Sealcoat is a surface coating, not crack repair, and cracks that were filled will look a little different from the rest.
• A faint smell for the first day or two.
• Light tire marks where you park, fading over the following weeks.

Worth photographing and reporting:

• Footprints or animal tracks set into the surface.
• Streaks, thin areas or bare spots after rain.
• Peeling, flaking or a coating that comes up on your shoe after the time the crew said it would be ready.
• Thick puddled spots that are still soft and tacky after a week.
• Sealer on things that were not supposed to get it: the garage floor, a walkway, siding, a stamped concrete border, the mailbox post.
• A white haze on a concrete sealer still there after a week.

Worked example: one driveway, one afternoon storm

The setup. A crew finished sealcoating an asphalt driveway at 2 p.m. on a sunny 78 F day. Most of the driveway gets full sun; the top third, by the garage, sits under a large maple and stays shaded until late afternoon. The crew's card said: foot traffic tomorrow at 8 a.m., cars after 48 hours, sprinklers off for 48 hours. The forecast showed a 30 percent chance of a shower that evening.

What the owner did right away. Taped both ends, moved both cars to the street, turned off the two sprinkler zones along the driveway, and set a phone reminder for 48 hours to turn them back on. They wrote the crew's times on the card and put it in the kitchen drawer with the receipt.

What happened. A short, hard shower came through at 9 p.m., 7 hours after the crew finished.

HOURS AFTER CREW FINISHED (finished 2 p.m.)

  0  2 p.m.   coating on, tape up, cars on street
  7  9 p.m.   hard shower, about 20 minutes
 18  8 a.m.   crew's foot-traffic time
 21 11 a.m.   owner's walk and photos
 48  2 p.m.   crew's car time; sprinklers back on
     (day 2)
168  day 7    second walk and photos

The 11 a.m. walk, 21 hours in. The sunny two-thirds looked even and dry. At the bottom, where the driveway meets the street apron, there were three gray streaks about a foot long, and a gray film had dried on the gutter line in the street. The shaded third by the garage was still slightly tacky to a fingertip at the edge, 21 hours in, against the 18 the crew had given for foot traffic. That is the shade doing exactly what shade does.

What the owner photographed. Each streak close up with a shoe in the frame for scale, then a wide shot showing where the streaks sit on the driveway, then the gray film in the street, then the tacky shaded corner. They kept the phone's timestamps on.

What they did not do. Walk on the shaded third, hose the film off the street, or move the cars back early to "check if it was ready."

The call. The same morning, the owner sent the crew the photos and a two-line note: shower at 9 p.m. last night, about 7 hours after you finished; streaks at the bottom edge, shaded section by the garage still tacky at 11 a.m. The crew came back the following week and touched up the bottom edge once the coating had fully set. The shaded section was firm by the second morning, so the cars went back at the 48-hour mark as planned, rolling in straight and not turning in place.

The day-7 walk. Faint tire marks where both cars park, no new streaks, the touched-up edge blending in. Nothing more to report.

What would have changed the answer. If the shower had come before the coating skinned over at all, within the first hour or two, the wash-off would likely have been far worse than three streaks, and the crew might have needed to redo the whole lower section rather than touch up an edge. If the owner had waited two weeks to call, the crew would have had a harder time telling rain damage from wear, and the photos with their timestamps are what tie the streaks to that night.

References

• The crew's written cure instructions and the product's data sheet, which govern the times for your driveway
• Poison Control: 1-800-222-1222 for skin, eye or swallowing exposure in the US
• See related: How to Photograph and Record a Problem for Your Contractor
• See related: Your House Records File and What Goes In It
• See related: How to Walk Through a Finished Job Before Final Payment