STONETECH Heavy Duty Grout Sealer is a water-based, penetrating sealer designed specifically for cement-based grouts and offers advanced protection against oil and water-based stains. A heavy duty sealer that blocks dirt and stains, keeping grout looking newer longer and ultimately improving clean-ability in interior and exterior applications. Better for you and the environment, STONETECH Heavy Duty Grout Sealer is also a safer alternative to solvent based sealers and comes with a 10 product guarantee.