How Often Should Granite Be Sealed? The Honest Answer for Chicago Homes
By Granite Heroes Team · 2026-09-04
"Every year" is a sales line, not a rule. Here is how to test whether your granite actually needs sealing, which stones rarely do, and how professional sealing differs from the bottle at the hardware store.
If you search this question you will find answers ranging from "every six months" to "never." Both can be right, because the correct interval depends on the stone, the sealer and the kitchen. Here is how we actually decide. The water test Put a few drops of water on the counter in the spot that gets the most use — usually beside the sink. Wait ten minutes and wipe it up. If the stone under the drop has darkened, water is soaking in and the sealer is no longer doing its job. If the stone looks the same, it does not need sealing yet, no matter what the calendar says. Do the same with a drop of cooking oil in an inconspicuous corner if you want a more demanding test. Oil takes longer, so give it 30 minutes. Dense granites rarely need sealing Many dark and fine-grained granites are so dense that sealer barely penetrates them in the first place. Sealing these on a schedule mostly leaves residue on the surface, which then causes the haze we wrote about in [why granite loses its shine](/news/why-granite-loses-its-shine-chicago-kitchens). Lighter, more porous granites — many whites, creams and some golds — genuinely benefit from sealer and will fail the water test sooner. Professional sealer versus the bottle at the store Retail sealers are formulated to be safe for anyone to apply, which usually means lower solids and a shorter working life. A professional-grade impregnating sealer applied to a clean, dry, properly prepared stone should last several years in a normal kitchen, not se