Half the countertops we see have never been sealed; the other half are sealed five times too often. The 60-second water test, the real schedule, and a step-by-step that takes one evening.
Sealer questions are the most common care questions we get, and the confusion is understandable — the answer is different for every material, and the internet mostly wants to sell you product. Here's the whole story in one place.
First: what never needs sealing
Engineered quartz never needs sealing. Neither do porcelain, sintered surfaces like Dekton, or solid surface. They're non-porous — there's nothing for a sealer to soak into, and applying one just leaves a hazy film we then get asked to remove. If a product promises to “protect your quartz,” save your money.
Soapstone is the natural-stone exception: it's non-porous too. Mineral oil or wax on soapstone is purely cosmetic (it deepens the color) — not protective.
What does: granite, quartzite, and marble
Natural stones are porous to different degrees. A sealer — technically an impregnator — soaks into those pores and buys you time: a sealed stone gives you minutes-to-hours to wipe a spill before it can absorb, instead of seconds. It does NOT make stone stain-proof, etch-proof, or maintenance-free; it makes it forgiving.
How often, really
- Dense granites: every 2–5 years — some nearly never. Trust the water test over the label.
- Lighter/more porous granites and most quartzites: roughly yearly.
- Marble and limestone: every 6–12 months — and remember sealer does not stop etching, only staining.
- We apply a premium 15-year-class sealer at installation, so new tops from us are covered for years before the water test says otherwise.
How to reseal in one evening
- Clean thoroughly with a stone-safe cleaner (no vinegar, no bleach) and let the stone dry completely — ideally 24 hours.
- Apply an impregnating sealer generously with a soft cloth or applicator, keeping the surface wet with product for the dwell time on the bottle (usually 10–15 minutes).
- Wipe ALL residue off before it dries — sealer left to dry on the surface causes haze, which is the #1 DIY mistake.
- Porous stones may want a second coat 30 minutes later. Avoid heavy use for 24 hours while it cures.
