Sealer is sunscreen for concrete. It keeps water, road salt, and oil out of the pores, and a driveway that is sealed lasts years longer than one that is not. The job itself is simple — clean, fix, dry, roll — but every step has one mistake that ruins the result. The most common is sealing over a dirty driveway: the sealer sticks to the dirt, not the concrete, and peels off in sheets by spring.
Pour a little water on the driveway. If it beads up, the old sealer is still working. If it soaks in and darkens the concrete, it is time. New concrete should wait at least 28 days to cure before sealing. Driveways in cold climates with road salt need sealing more often — every two years — while a shaded driveway in a mild climate can go three or four. A driveway that is already cracked and crumbling needs repair first: sealer is a coating, not a crack filler, and the concrete crack repair guide covers the fix that comes before the sealer.
Clean it. Pressure wash the driveway or scrub it with a stiff broom and a concrete cleaner. Get the oil stains out first — sealer will not stick to an oil stain, and the stain will show through. The pressure washer safety guide covers the cleaning step without damaging the concrete.
Fix the cracks. Fill the cracks and let the filler cure fully before you seal. Sealer over an open crack is wasted: water runs straight through it. Small cracks take a day to cure; larger patches take longer — read the filler label.
Let it dry. Wait 24–48 hours after cleaning before you seal. The concrete must be dry all the way through, not just on the surface. Tape a square of plastic to the driveway for a day: if moisture collects under it, the concrete is still wet.
Pick the sealer. Penetrating sealers soak in and leave no shine — they are the usual choice for driveways. Acrylic sealers sit on top and add a shine, but they wear faster and can get slippery when wet. Buy enough for two thin coats, and check the coverage on the label: most cover 200–400 square feet per gallon.
Roll the first coat. Pour a line of sealer and spread it with a long-handled roller in thin, even strokes. Work in sections from the far end toward the street so you never walk on wet sealer. Thin coats dry evenly; a thick coat stays tacky and peels.
Let it dry, then roll the second coat. Wait 2–4 hours, or whatever the label says, and roll the second coat in the opposite direction. Two thin coats last longer than one thick one and cover the spots the first coat missed.
Keep it closed. Block the driveway with cones or sawhorses. No foot traffic for 24 hours, no cars for 48–72 hours. A tire on sealer that is not fully cured leaves a permanent mark. The same patience applies to the rest of the hardscape — the sunken paver repair guide covers the pavers next to the driveway.
| Penetrating (silane/siloxane) | Acrylic (film-forming) | |
|---|---|---|
| Look | No change, matte | Shine, darkens the concrete |
| Lasts | 3–5 years | 1–3 years |
| Slippery when wet | No | Can be, without an anti-slip additive |
| Best for | Driveways, cold climates | Patios, decorative concrete |
For a driveway, penetrating sealer is the usual answer: it lasts longer, it does not get slippery, and it does not peel. Acrylic looks better on a patio, where the shine is the point.
Sealing over dirt or oil is the big one — the sealer peels off in sheets. A coat that is too thick stays tacky and peels. Rain within 24 hours of sealing washes the coat off. Sealing new concrete before it cures traps moisture and turns the sealer white. And sealing in cold weather — below 50°F — means the sealer never cures properly. Check the forecast for two dry days above 50°F before you start.
Every 2–3 years, or when the water bead test fails. Cold climates with road salt need it more often; shaded driveways in mild climates can go longer.
Not right away. Wait at least 28 days for the concrete to cure. Sealing too soon traps moisture and turns the sealer white.
Rain within 24 hours can wash the coat off or leave it cloudy. Check the forecast for two dry days before you start, and if rain comes early, let it dry and add another coat.
For a driveway in a cold or wet climate, yes — sealer costs a fraction of a repair, and unsealed concrete cracks and spalls years sooner. For a shaded driveway in a dry climate, the benefit is smaller.