Clean the stone thoroughly with a mixture of water and detergent. Scrub the stone and grout with a sponge to remove any existing dirt or loose debris. Rinse the area thoroughly to remove any soap residue.
Mix the stone sealant with water according to directions on the package. Some sealants are pre-mixed in spray bottles.
Spread the sealant onto the stone and grout with a paintbrush or using the included spray bottle. Brush the sealant into the cracks and crevices of the stone with the paintbrush. Allow the sealant to dry according to the drying times on the container.
Reapply as necessary to get the desired finish.
Wipe any excess sealant up with a dry cloth.