Will Sealer Darken Stone

The above answer is correct — an enhancing sealer will darken the stone but otherwise should not. Even so, I would test any sealer on a sample of the material before using it in the installation just to make sure.

Does sealing stone change the color?

Myth: Sealing will change the color of my stone. If you are sealing a polished limestone, travertine, marble, or granite, the impregnator will not change the color and will not add shine. However, if you are sealing a darker stone with a honed finish, the impregnator may slightly darken the color.

What does a sealer do on stone?

Sealing adds a barrier to the stone, which helps prevent staining by giving you extra time to clean up spills that would otherwise soak into the stone immediately. While no stone sealer is truly stain-proof, high-quality sealers provide stain resistance by extending the reaction time of the contaminant on the stone.