Sealer needs clean concrete, dry concrete, and a temperature window this state only hands out twice a year. Getting the timing right is most of getting the job right.
Sealer is a coating that has to cure. It wants a surface temperature in roughly the 50 to 90 degree range for most products, air that is not saturated, and no rain for at least a day after it goes down. Central North Carolina gives you that reliably twice a year.
| Window | Why it works | Watch out for |
|---|---|---|
| Mid-April to early June | Warm days, nights above the cure floor, pollen mostly finished by late May | Sealing during peak pollen traps a yellow film under the coating. Wait for it to finish. |
| Mid-September to late October | Mild, lower humidity than summer, long dry stretches | Leaf drop. A wet leaf sitting on tacky sealer leaves a print you cannot remove. |
| July and August | Technically warm enough | Afternoon storms, and surface temperatures high enough that sealer flashes off before it penetrates. Early morning work only, and still a gamble. |
| December to February | Nothing recommends it | Night temperatures below the cure floor. The coating never sets properly and it will fail. |
Humidity is the variable people forget. A 70 degree day at 90 percent humidity after two days of rain is not a sealing day, no matter what the thermometer says, because the slab is still holding water.
This is the part that decides whether the job was worth doing. Sealer is transparent and permanent-ish, so whatever is on the concrete when it goes down is preserved under it.
Rust, oil, and clay all need their own chemistry. Sealing over a rust stain locks it in permanently, and the only way back is to strip the sealer.
A full day at minimum after washing, and longer if it is humid or the slab is shaded. Concrete holds water well below the surface where you cannot see it.
Twenty-four hours dry after application, minimum. This is the step that gets skipped when a crew is trying to fit a job in.
And then keep traffic off for the time the product specifies, which is usually longer for vehicles than for feet.
A fresh pour needs to cure before anything coats it. Twenty-eight days is the standard figure and it is a floor rather than a target. Concrete releases moisture and alkalinity as it cures, and sealing too early traps both, which shows up as a cloudy white haze in the coating that cannot be fixed without stripping it.
There is a second reason to wait on a new driveway around here: efflorescence. The white powdery bloom that appears on new concrete is mineral salts working their way out, and that process wants to finish before you cap it. On plenty of new builds around Flowers Plantation and Wilsons Mills the sensible answer is to let the first full year go by, watch what the slab does, then seal it.
A paver patio or driveway is not a slab with lines on it. The joints between the units carry the load transfer, and the sand in those joints is doing structural work rather than cosmetic work.
A driveway that gets full sun and vehicle traffic typically wants resealing every two to three years. A shaded walkway or a covered patio holds a coating longer. Stamped and coloured surfaces sit at the shorter end because the finish is what is protecting the colour.
Worth doing on: pavers, stamped concrete, coloured concrete, a patio you care about the look of, and a driveway where you keep fighting stains. Less compelling on: a plain grey utility driveway you are indifferent to, and any slab that is already spalling, because sealer does not repair damage and can make a failing surface look worse.
And do not seal a slab just before selling the house. It is a maintenance decision with a multi-year return, not a photograph.
The cleaning is most of the setup for the sealing. If you were going to seal anyway, having the wash and the seal done as one booking is cheaper than two, because the crew is already there and the prep is already done. The only thing separating them is the dry time, which we schedule around rather than charge for.
Call (919) 698-3669 and tell us what surface you have and roughly how old it is. If it is too new to seal, we will say so and tell you when to call back.
“Did a great job on our pavers and driveway. Got out sap and pollen I did not think would ever come up.”
“Long driveway with years of clay stains. It came out even end to end with no stripes anywhere.”
“One of the most professional and organized companies I have worked with. Driveway looks incredible.”
Aluminum chalks for a different reason than vinyl does, and the decision at the end is different too. How to test what you have, what a restoration wash actually achieves, and when paint is the honest answer.
Read the guide →HOAWhat a multifamily property actually needs cleaned, how often, and why the surfaces that generate complaints are almost never the ones in the budget.
Read the guide →BookingWhere the truck parks, whose water we use, how long it takes, whether you need to be home, and the short list of things to move, close, or unplug before we get there.
Read the guide →We fly the roofline and show you the footage on the spot. You see your own gutters, joints, and downspouts on the screen instead of taking our word for it. It costs nothing and you are not committing to the cleaning.
Free for homes and businesses across the Triangle and Johnston County. No obligation to book any work afterwards.
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