Natural stone can be dense or porous and is absorbent to some degree. Stones that have more swirls or veins tend to be more porous and absorbent. A sealer is like a coat of armor for your countertop. Sealer will decrease the opportunity for something to stain or harm your surface. A protected stone will be easier to clean, resist staining, and provide a safer and healthier environment. Also, by sealing your stone, you will retain the natural beauty of the surface.
To test your countertops sealants, apply a drop of water at least ½-inch in diameter to the stone and let stand for at least 15 minutes. Cover with a glass to reduce evaporation. If the stone does not darken then it is probably sealed against water-based stains. To ensure the beauty of your stone, we recommend sealing your stone yearly.