Can pavers be sealed in the Naples summer heat?

NOAA's thirty-year normals put Naples' normal daily high at 89.8 F in June, 90.8 in July, 90.9 in August and 89.6 in September, each an average rather than a forecast for any single day; the twelve-month normals table carries every other month.

Set that beside one maker. Techniseal's WL1-2 data sheet says the temperature must be between 10 and 30 C, about 50 to 86 F, and its NS sheet prints 50 to 85 F during the application and for the next 24 hours. All four of those normal highs sit above both figures, which is Techniseal's limit for its own products, not a rule about Naples summers in general.

The NOAA normals quoted here carry rain and temperature, not humidity, so humidity is a condition read on the day. The ASCC Decorative Concrete Council guide, a document about concrete sealers rather than a paver standard, says that above 70 percent relative humidity any type of concrete cure and seal or penetrating sealer will take longer to dry, and that high humidity during application and drying of a water based sealer may make it dry with a white appearance or chalky consistency.

The ASCC guide's advice for hot weather is about timing: "Application during warm weather is best done early in the morning or late in the evening, during the coolest part of the day." The same guide says a solvent based sealer used in hot weather or in direct sunlight can bubble, which in turn leads to peeling or flaking.

A shaded section of the same driveway dries on a slower clock, covered on sealing pavers in the shade, and the gap between a sealer drying to the touch and curing through is defined on cure time.

SEK-Surebond's SB-1300 window runs 40 to 95 F for air, with a 120 F surface ceiling; Seal 'n Lock's Super-Wet-Look gets best results between 60 and 90 F. Neither figure is Techniseal's, and none of the three is a paver association's number. Which ceiling applies, and whether it is measured in the air or on the pavement itself, is answered in full on what temperature is too hot to seal pavers.

Summer in Naples also carries about two thirds of the year's normal rain, June through September, and the rain windows before and after application are their own question on sealing during the rainy season. What a driveway looks like once the heat and the cure are behind it is answered on how soon after cleaning pavers look their best.