Why Marble Should Be Sealed After Polishing

Why unsealed marble is a real risk

Marble's porous structure means liquids — coffee, wine, oil, even coloured cleaning products — can soak into the stone itself rather than sitting on the surface. Once absorbed, a stain is far harder to remove than one sitting on top of a sealed, protected surface, sometimes requiring the same grinding process used for the original polish.

Sealant works by filling the stone's microscopic pores, giving liquids time to be wiped away before they penetrate. It doesn't make marble stain-proof, but it buys crucial time and significantly reduces how deeply anything soaks in.

Sealed vs. unsealed marble

How to know if your marble needs sealing

• The water droplet test: place a small amount of water on the marble. If it beads up, sealant is likely still active. If it darkens the stone and absorbs within a minute or two, it's time to reseal.
• After any professional grinding or honing, sealant should always be reapplied — the process removes the old sealed layer along with the worn surface.
• High-traffic or spill-prone areas (kitchen counters, dining room floors) benefit from checking and resealing more frequently than low-traffic rooms.
• Don't assume "polished" means "sealed" — always confirm explicitly with your contractor whether sealing is included in the quote.