Can you seal pavers in the shade?

Seal 'n Lock's own product guide draws the contrast in one sentence: its Super-Wet-Look “will normally dry in sunny areas within approximately 1 hour,” while “Shaded areas, lower temperature or high relative humidity will slow the drying process.” That is one maker's figure for one product, but the direction is not unique to it.

SEK-Surebond's SB-1300 sheet gives a related warning for its own sealer, without naming shade: “Low surface or air temperature and or high relative humidity will extend dry times.” A shaded corner can differ from a sunny one on temperature and dampness, and a sheltered one on wind as well.

Techniseal's application conditions require the surface to be “clean, dry and warm to the touch,” and a section of pavers sitting in shade can simply be cooler than the section a few feet away in full sun, which is a difference of surface temperature rather than of the sealer itself.

Humidity is the other half of it, and what humid, still air does to a water based sealer's cure is set out under sealing pavers during the rainy season. The Decorative Concrete Council's guide, written for concrete sealers rather than pavers, says many sealer problems can be alleviated by sealing when the air and surface temperature are “equal, and moderate (50-65°F (10-18°C)),” a range for decorative concrete, not a paver rule. The difference between a surface that is dry and one that has cured is set out under dry time.

Shade is not only a delay. The Decorative Concrete Council's concrete guide says direct sunlight and wind during application “can cause a solvent based sealer to bubble or turn white,” because the sealer will “skin over” before the solvent has fully evaporated, and that this “can be prevented by applying sealer in cool weather, or on a calm, overcast day.” For that kind of product, on that surface, the guide treats direct sun as the riskier condition.

SEK-Surebond lists shaded areas among the surfaces it calls its SB-1300 ideal for, alongside pool decks and outdoor showers, which is a statement about where growth is a concern rather than an instruction about sealing in shade. Pavers under a lanai roof raise a separate question, answered at whether pavers under a lanai can be sealed, and sun and heat on the open half of a driveway are the subject of sealing in the Naples summer heat. If a shaded section still looks damp after the sunny half has dried, why pavers can look dry and still be too wet to seal is the next read, and a tacky patch that shows up afterward belongs with sticky pavers after sealing.