BLOCK OUT
Water Repellent and Protector
BLOCK OUT is a premium, water-based sealer engineered to provide deep, long-lasting protection for natural stone, pavers, tile, and grout. Once applied, Block Out creates a transparent, vapor-permeable barrier that repels both water and oils, helping surfaces stay cleaner and more resistant to stains. Block Out chemically bonds within the surface, internally sealing the substrate. This allows water vapor to breathe out of the stone, while inhibiting moisture and oils from penetrating the surface.
BLOCK OUT penetrates immediately, deeply, and effectively, providing a long-lasting protective barrier. Block Out inhibits algae, mildew, and efflorescence while protecting from water damage and corrosion. Surfaces treated with Block Out will retain a natural appearance with no shine or gloss. For interior and exterior use.
FOR USE ON: Marble, Travertine, Concrete, Shell Stone, Limestone, Brick, Slate, Quarry Tile, Grout, Cement, Clay Pavers, Saltillo, Unglazed Ceramic Tile, Terracotta, Terrazzo, Granite, Sandstone, Basalt, Porcelain & most other porous stone or concrete surfaces.
SHOP BLOCK OUT
KEY BENEFITS
• Repels both water and oils for superior stain resistance
• Deep penetration for durable, long-lasting protection
• Transparent, breathable barrier prevents moisture entrapment
• Helps inhibit efflorescence, mildew, and algae growth
• Retains natural appearance with no surface film, shine, or gloss
• Suitable for interior and exterior use
SURFACE PREPARATION & APPLICATION:
Block Out can be applied using a roller, brush, flat mop, low pressure sprayer, or other suitable applicator. Ensure the surface is clean, dry, and free of dirt, grease, oil, or wax before application. Apply the sealer evenly and uniformly, wetting the entire surface. Allow to dry for at least 30 minutes, then apply a second coat. Any excess sealer not absorbed after 30 minutes can be spread across the surface and allowed to dry or wiped up with a dry mop or clean cloth. Product fully cures in 24–48 hours. When used prior to grouting, BLOCK-OUT acts as a grout release, helping simplify grout cleanup.
COVERAGE:
For very porous surfaces: 200-300 sq. ft./gallon.
For average density surfaces: 300-500 sq. ft./gallon.
For very dense surfaces: 500 sq. ft./gallon+
STORAGE AND HANDLING
CAUTION: Do not handle until all safety precautions have been read and understood. Handling: Do not get in eyes, on skin, or on clothing. Do not breathe vapors or mists. Keep container closed and tightly sealed when not in use. Keep away from sources of ignition - No smoking. Take measures to prevent the buildup of electrostatic charge. Conditions for safe storage: Keep in tightly closed, properly labeled containers. Keep in a cool, well-ventilated place.
TECHNICAL SUPPORT
Technical Support is available by calling (813) 876-5914
Emergency Support: ChemTel: 1 (800) 255-3924
BY MAIL: Catalina Chemical Co. 4709 N. Lois Ave. Tampa, FL 33614
TRANSPORTATION
Class 55 Floor Product
DOT: Not Regulated
PACKAGING
Available in: 1 quart, 1 gallon, 5 gallon, or 55 gallon drum quantities
