Although we usually think of stone as "hard," it is a porous material. Natural stone has varying degrees of porosity depending on the type of stone. If left unsealed, spills and everyday messes can easily penetrate the surface. The liquid eventually evaporates but the stain is left behind.
Highly acidic substances such as orange juice, coffee, and wine will also etch sensitive stones and leave a dull mark. Acid-resistant stones such as most granite, slate, and sandstone will not etch.
To help protect your stone, we recommend using:
Stonetech® 24 oz. Natural Stone Sealer