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Product description Laticrete Stonetech Heavy Duty Exterior Sealer 1 GALLON (3.8L) Amazon.com The StoneTech professional heavy duty exterior stone and masonry sealer is a superior water repellent and stain protector for all interior and exterior stone, ceramic tile, marble, limestone, granite, grout, saltillo tile, slate, terrazzo, travertine, sandstone and clay products. The liquid emits a very low odor, allowing the product to be used for interior or exterior jobs, and provides coverage for up to 1,000 square feet. The stripper is weather resistant, can inhibit efflorescence, repels water, has non-yellowing properties, and is great for building facades. It is also contains FDA compliant solvent and is chlorine resistant.