Sealcoating is useful on the right driveway at the right time, and a waste of money on the wrong one. This is the list a company selling it does not usually print: what it cannot do, what goes wrong when it is overdone or badly timed, and the situations around Raleigh where the honest advice is to keep your money.
This one is local. Most driveways in newer Triangle subdivisions are poured concrete, and every year some of their owners get talked into a coat of asphalt sealer. It is the wrong product for the surface. It does not soak in the way it does on asphalt, it wears off unevenly, and it leaves a black film on a slab that was never meant to be black.
If your drive is concrete, this whole page is beside the point. Sealcoating is an asphalt product. Say so on the form and you will be told what, if anything, the concrete needs.
Sealer is a thin protective layer. It does not bridge a pothole, hold together a patch of alligator cracking, or lift a section that has sunk where the clay underneath went soft. Painted over, those defects come back through within a season looking exactly as they did, only now they are black.
When a drive is past sealing, the money belongs in a cut-out repair or a new surface. The repair page explains how to tell which.
Sealing every year feels like looking after the drive. In practice the layers build up faster than traffic wears them away, and a thick crust of old sealer cracks in its own pattern and flakes off in sheets, often taking the top of the asphalt with it. On a house drive here, every two to three years is plenty. Some drives under heavy shade go longer.
A fresh coat is smoother than weathered asphalt, and on a steep drive in a summer downpour that can be noticeable. Many sealers have sand mixed in to give some grip back, and the effect fades as the surface wears in. On a steep drive or a lot with foot traffic, it is worth asking what is in the mix.
The long Carolina summer is good for curing and hard on scheduling. NOAA's normals for Raleigh-Durham count around 52 days a year at 90F or hotter, and the state's summers bring frequent afternoon and evening thunderstorms. Coat at the wrong hour and the surface flashes dry over a soft middle, or a storm washes half of it into the gutter. Neither is a disaster when the contractor owns it, but both are a reason to hire one who watches the radar rather than one who wants to finish the street before dark.
A new coat is soft on hot afternoons until it has cured, and tires turned while the car is stopped scuff it. Kickstands and trailer jacks dent it. These marks fade, but anyone who expects a showroom finish on day three is going to be disappointed. The stay-off guide covers the habits that avoid most of it.
Every warm season brings a round of door knocking with leftover material and a price for today only. The tell is in what is skipped: no crack filling, no cleaning, thinned sealer. On the day it looks identical to a proper job. By the next summer the cracks are through, the coat has worn off where the tires run, and the drive is back where it started. A written quote that lists what is included is the only protection, and it costs nothing to ask for.
Fresh sealer has a strong smell for a day or so, which carries into a garage left open and into the house on a still, humid evening. Until it is fully dry it also tracks: on shoes, on paws, on bike tires, and from there onto carpet and a concrete garage floor. Keep the garage door shut, keep pets on the grass, and expect a day of mild inconvenience.
On sound asphalt that has gone gray and started letting water in, a coat every few years with the cracks filled is the cheapest maintenance there is. It slows the sun damage that this climate hands out generously, keeps storm water out of the clay base, and puts off the day the drive needs repaving. That trade is the whole case for it, and it only holds on the right drive.
If you are not sure which side of the line yours is on, send the address. If the answer is that it can wait, or that it is concrete, that is the answer you get.
