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Home / Stone Care / Sealing Natural Stone

Sealing Natural Stone

When to seal, which sealers to use, and how to apply them.

By Monterra Stone Team Reviewed by Senior Stonemason Published July 2026 Updated July 2026 Sealing

Sealing is the single most cost-effective thing you can do to protect natural stone. It doesn't make stone bulletproof — but it buys you time when spills happen, turning a would-be stain into a wipe-up.

Feature image — supplied by Monterra at content stage

What a sealer actually does

A penetrating (impregnating) sealer soaks into the stone's pores and slows the absorption of liquids. It does not form a surface coating, doesn't change the look of the stone (unless you choose an enhancing sealer), and doesn't prevent acid etching. Its job is stain resistance, full stop.

How often, by stone type

Marble and limestone: every 12 months. Travertine: every 6–12 months. Granite and quartzite: every 1–3 years depending on density. Terrazzo (cementitious): every 12 months. Porcelain and zero-silica: no sealing required. Your product page on this site lists the schedule for each specific material we stock.

Step-by-step / product imagery placeholder

The water test

Sprinkle a tablespoon of water on the surface and wait 10 minutes. If it beads or sits on top, the sealer is working. If the stone darkens underneath, it's absorbing — time to re-seal.

How to apply a penetrating sealer

Clean the surface thoroughly with pH-neutral cleaner and let it dry completely — ideally 24 hours. Apply the sealer evenly with a clean cloth or applicator, keep the surface wet with sealer for the dwell time on the label (usually 5–15 minutes), then wipe off ALL excess before it dries. Residue left to dry causes hazing. Allow the full cure time before heavy use.

The most common DIY mistake we see is leaving excess sealer to dry on the surface. Sealer belongs in the stone, not on it — always buff off the excess.

Frequently asked questions

Do I need a professional to seal my benchtop?
Routine re-sealing is a genuine DIY job for most owners. Initial sealing at installation, enhancing sealers, and fixing hazing are best left to professionals.
Will sealing stop etch marks on marble?
No. Sealers resist stains (absorption), not etching (chemical reaction with the surface). Only keeping acids off the stone prevents etching.
Which brand of sealer should I buy?
We'll recommend a specific product for your exact stone when you purchase — quality varies a lot. Ask us via the stone-care enquiry form.
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Products & Further Reading

Daily Natural-Stone Cleaning → Marble Care Guide →