How long does paver sealer last?

The Interlocking Concrete Pavement Institute's Tech Spec 5, its technical note on cleaning and sealing concrete pavers, declines to put a date on a sealer. Its sentence is “Sealers normally require reapplication after a period of wear and weather.” The next sentence names what sets that period: “The period of reapplication will depend on the use, climate, and quality of the sealer.”

Those three words carry the whole answer. Use is what crosses the surface: a driveway takes tires turning and braking, a walkway takes feet, a patio takes furniture legs. Climate is the weather the film sits under every day of the year. Quality is the product itself, which is why two sealed surfaces side by side can wear at different speeds.

ICPI's only service-life language is a hedge, and it is about acrylic sealers alone. Acrylics, the institute writes, are widely used on residential and commercial pavers, and “They generally last for a few years in these applications before re-coating is required.” That is ICPI's wording, and it is not a number. Turning “a few years” into two, three or five is a step the institute does not take.

The numbers a homeowner finds come from sealer makers, and each one is written about that maker's product, with a condition attached.

Read together, three of the four rows tie their figure to traffic, climate or site conditions in the same breath, and none is written for any product but its maker's own. Techniseal goes furthest toward the wear condition, telling the reader to wait until the Protector is worn, and it says a sealer from another brand should normally take approximately two years to wear, “or maybe less in the case of an economical sealer.”

When to act on any of this is a separate question, and the paver cleaning page answers it where it explains re-coating and why sealed pavers turn white: reapplication follows wear, not a date. The figure that applies to one particular driveway is the one on the label of the product that went down on it.

A sealer is not a permanent layer. The American Society of Concrete Contractors' Decorative Concrete Council, writing about decorative concrete sealers of the same acrylic and urethane chemistries, calls it a sacrificial coat and says “it should be expected that over time sealer will show wear, and eventually need reapplication.”

The same guide draws the line homeowners tend to miss: sealers are “scratch and stain resistant”, not “scratch and stain proof”. Every tire that turns on a driveway and every grain of sand dragged across a walkway takes a little of the film with it. Techniseal's data sheets likewise name heavy traffic, alongside extreme climate, as something that can limit how long its protectors last.

The practical result is that one property can carry several sealer lifespans at once. The strip of driveway where cars turn, the walkway to the front door and a covered patio were sealed together, and they can reach the end of the film on their own schedules, which is what ICPI's three words, use, climate and quality, would lead a reader to expect.

Because ICPI sets no date and the makers tie their own figures to wear, the end of a sealer is read off the surface. The ASCC guide lists what to look for: “Faded areas, and blotchiness, especially when the surface is wet, are all signs of a surface needing new sealer.”

The phrase “especially when the surface is wet” is the useful part: a rinse or a rain is when uneven wear is easiest to see. That observation is about the look of the surface; whether water still beads on it is a different screening test, set out under how to tell if pavers were sealed before.

The span between one coat and the next is sometimes called the recoat window. None of the documents quoted on this page uses that phrase, and the only numbers attached to it are the makers' own, printed with their products in the table above.

Two sealers can wear out at the same pace and still leave different jobs behind, because ICPI separates acrylics from urethanes by what happens once they are worn.

Which family a product belongs to is printed in its maker's documents, and what renewal involves for each family is set out under how paver sealing handles a worn acrylic or urethane.

Two more questions sit next to this one. A new coat going over an old one of a different kind is its own problem, covered under whether new sealer can go over an old sealer. And adding coats too often carries risks of its own, which Techniseal's guide names for its protectors as build-up, whitening and peeling; the reasons are set out under whether pavers can be resealed too often.