Sealing protects stone and grout from staining. Our sealer is an impregnating sealant that provides protection against water and oil-born materials that will stain stone. Our sealer also protects sand-based and latex grout so that stains do not penetrate, nor will mildew form. This allows stone and grout to remain in their originally installed condition. Under normal use, the sealing properties are effective for eight to ten years.