A twenty-minute job twice a year that decides whether the slab still looks new in a decade.
Why marble needs sealing at all
Marble is calcite, and calcite is porous. Left alone, coffee, wine and lemon all find their way in and stay there. A penetrating sealer does not sit on the surface like a lacquer — it fills the pores just below it, so the stone still feels like stone.
What you need
- A pH-neutral stone cleaner
- A penetrating sealer, not a topical coating
- Two lint-free cloths
- Twenty minutes you are not in a hurry for
The job itself
- Clean the surface and let it dry completely.
- Pour a small amount of sealer and spread it evenly.
- Let it sit for the time on the bottle — usually ten minutes.
- Wipe the excess away before it dries.
If the sealer dries on the surface, you have made a mess rather than a finish. Work in small areas.
A drop of water should bead after this. If it soaks in instead, do it again.
Twice a year is the honest answer for a kitchen. A bathroom vanity needs it once.
