100% guaranteed against oil and water based stains. Perfect for granite, marble, slate, limestone, sandstone, flagstone, concrete and grout. Is UL classified for slip resistance. Excellent stain protection on all stone surfaces. Allows the stone to breathe and release moisture vapors. Spray-on, water-based formula. Acid-resistant. Safe to use around the house. For interior and exterior applications. Safe to use on food-handling areas.