Stonetech Bulletproof Sealer - 1 Quart/32 Oz (946Ml) (ST302-0632). STONETECH BulletProof® Sealer is the premium, water-based penetrating sealer, designed to provide maximum stain protection against the toughest oil and water-based stains. This professional grade sealer effectively impregnates into the most porous natural stone, tile, masonry and grout surfaces in interior and exterior applications and does not alter the natural look of the surface. Best protection for the most porous natural stone, tile, masonry & grout. Water-based formula is better for you and the environment. For interior and exterior use. Professional grade. Covers up to 225 square feet per quart, single coat.