Does sealing change the color of pavers?

Both paver sealer makers on this page write a test step into their instructions before a whole driveway or patio is sealed. Techniseal's NS data sheet says to always test on a small hidden area of about 4 square feet to make sure the result meets expectations, and SEK-Surebond's SB-1300 sheet says to test the sealer first on a small inconspicuous area to determine suitability and whether the desired result is achievable.

The test exists because the result depends on the surface the sealer goes onto, not only on the product.

ICPI's line for concrete pavers is that most sealers darken the surface and intensify the colors already there. Euclid Chemical, writing about the same class of product on poured concrete, agrees on the mechanism: most acrylic sealers darken the surface and add some shine, and the color after sealing is difficult to predict because every slab is unique in its own color and texture.

Euclid's own sentence, written for poured concrete, is that “A sealer will deepen the true color of concrete and will highlight all the differences in the surface texture that result from floating and finishing.” Its advice when color change is a concern is a penetrating water repellent sealer, or a small test application of a film-forming sealer. How much darker each sealer family reads on a paver, gloss against flat, is answered under whether sealing makes pavers darker.

Some of what shows up after sealing was on the surface before the sealer went on, or is the surface itself: residue a cleaning left behind, and texture differences a sealer makes visible. Those causes of an uneven result are set out under why a patio looks blotchy after sealing, and the trade's reasons for cleaning pavers with a chemical cleaner before sealing are on the paver sealing method page.

This page is about the color shift a properly applied sealer gives an evenly prepared surface, not a flawed job.

The sealer is not the only thing that can shift the look. W. R. Meadows says that under some conditions the granules of its SURE-STEP slip-resistant additive may be visible and, depending on the surface, may alter color or dull the surface, and it recommends a small application test section for that reason. A sealer with an additive in it is a different test from the sealer alone.

The finish is part of it too. Choosing between a wet look and a natural look in a paver sealer is covered on the paver cleaning page, the named products under matte and natural-look sealers by name, and why a sealed surface reads darker when it is wet under why sealed pavers look darker when wet. Whether a darker, sealed pool deck also runs hotter underfoot is taken up under heat underfoot on a sealed pool deck.