How Often Should Concrete Be Resealed?

How often should concrete be resealed?

The short answer

Figure two to three years between coats for a sealed driveway, patio, or stamped surface that sees regular traffic, sun, and winter salt. A slab that sits in shade or carries little traffic can go longer. A penetrating sealer, which soaks in instead of forming a film on top, tends to hold up longer between applications than one that sits on the surface and wears with foot and tire traffic.

What actually wears a sealer out

A sealer is a wear layer, not a permanent coating, and several things work on it every year it is down. Tires turning in the same spot scuff a film sealer faster than straight rolling traffic does. Ultraviolet light breaks the film down season after season, especially on a surface that sits in full sun most of the day. Water and de-icing salt cycle in and out of the surface all winter, and that cycle works on the sealer before it ever reaches the concrete underneath.

Direct sun, which breaks a film sealer down faster than shade
Tires turning in place, more than tires simply rolling across it
De-icing salt and the winter freeze thaw cycle
Standing water that sits on the surface longer than it should

Film sealers and penetrating sealers age differently

A film forming sealer sits on top of the concrete, and that is exactly what gives a driveway or a stamped patio its color and its shine. It is also exactly why it wears: every bit of exposure listed above is working on a thin layer sitting between the traffic and the concrete. Figure two to three years between coats for a film sealer on a surface that sees regular traffic, sun, and winter salt, closer to two under trees that drop sap and tannin or in full open sun, and possibly longer on a shaded, low traffic slab.

A penetrating sealer works differently. It soaks into the pores of the concrete instead of sitting on top, so there is no surface film for tires and weather to wear through the way there is with a film sealer. That trades away some of the color and gloss a film sealer gives, but it usually means longer stretches between applications.

How to tell it is actually due

The clearest sign is water. Sprinkle some on a sealed surface and a fresh coat beads it up into little domes. A coat that is due lets the water spread flat and soak in instead. Color is the other tell. A sealed surface that looks dull, dusty, or faded compared to how it looked freshly coated has usually lost most of its wear layer already, even before the water test confirms it.

What a recoat involves, and why doing it right matters

A recoat is not just rolling fresh sealer over what is already there. The surface has to be cleaned first, and it has to be fully dry all the way through, because sealing moisture into the surface is what causes the milky, cloudy look people sometimes blame on the product itself. Two thin coats hold up better and look better than one heavy one, and a heavy single coat is more likely to peel in sheets after a hard winter or two.

Terms on this page

Sealer Penetrating Sealer Stamped Concrete All concrete terms

Good questions

Does a plain broom finished driveway need to be sealed at all?

Not always. A broom finished driveway can often go without sealer and hold up fine for years on its own. Sealing it is optional, and worth doing mainly where staining is a concern.

What happens if I skip a recoat for a few years?

The surface keeps wearing without a wear layer protecting it. Water and salt work directly on the concrete instead of on the sealer, and by the time you get around to recoating, the surface may need cleaning and prep well beyond a simple fresh coat.

Can I reseal over an old sealer that is still mostly intact?

Usually, yes, as long as the surface is clean and fully dry. Sealing over grime, mildew, or trapped moisture is what causes a milky, cloudy look under the new coat instead of a clear one.