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may harm masonry. If freezing conditions have existed, let masonry thaw before cleaning. Equipment Apply using a densely-filled masonry washing (tampico) brush, roller or low pressure (50 psi max) spray. Do not apply with high pressure spray equipment. This drives the cleaner deep into the surface, making complete rinse difficult. Discoloration may result. Rinse with enough water and pressure to flush spent cleaner and dissolved soiling from the masonry surface and surface pores without damage. Inadequate rinsing leaves residues which may stain the cleaned surface. Masonry-washing equipment generating 400–1000 psi with a water flow rate of 6–8 gallons per minute is the best water/pressure combination for rinsing porous masonry. Use a 15–45° fan spray tip. Heated water (150–180° F; 65–82° C) may improve cleaning efficiency. Use adjustable equipment for reducing water flow-rates and rinsing pressure as needed for sensitive surfaces. Rinsing pressures greater than 1000 psi and fan spray tips smaller than 15° may permanently damage sensitive masonry. Water flow-rates less than 6 gallons per minute may reduce cleaning productivity and contribute to uneven cleaning results. Storage and Handling Store in a cool, dry place with adequate ventilation. Always seal container after dispensing. Do not alter or mix with other chemicals. Published shelf life assumes upright storage of factory-sealed containers in a dry place. Maintain temperature of 45–100° F (7–38° C). Do not double stack pallets. Dispose of unused product and container in accordance with local, state and federal regulations. APPLICATION Read “Preparation” and the Safety Data Sheet before use. ALWAYS TEST a small area of each surface to confirm suitability and desired results before beginning overall application. Test each type of masonry and each type of stain. Test with the same equipment, recommended surface preparation and application procedures planned for general application. Let test area dry 3–7 days before inspection and approval. Make the test panel available for comparison throughout the cleaning project. Dilution Dilute with a minimum 2 parts and up to 6 parts water to 1 part Limestone Restorer concentrate. Conduct test panels to determine the mildest dilution ratio which produces the most effective cleaning solution. ALWAYS TEST the final dilution rate producing the desired level of cleanliness. When diluting, pour cold water into empty polypropylene or polyethylene bucket, then carefully add cleaner. Acidic liquids and fumes attack metal. Product Data Sheet Sure Klean® Limestone Restorer Product Data Sheet • Page 2 of 3 • Item #20034 – 102623 • ©2023 PROSOCO, Inc. • prosoco.com Recommended for these substrates. Always test. Coverage is in sq.ft./m. per gallon of concentrate. Substrate Type Use?Coverage Architectural Concrete Block* Burnished Smooth Split-faced Ribbed no yes yes yes 300–700 sq.ft. 28–65 sq.m. Concrete Brick Tile Precast Panels Pavers Cast-in-place yes yes yes yes yes 300–700 sq.ft. 28–65 sq.m. Fired Clay Brick Tile Terra Cotta (unglazed) Pavers yes no no yes 300–700 sq.ft. 28–65 sq.m. Marble, Travertine, Limestone Polished no N/A Unpolished yes 100–250 sq.ft. 9–23 sq.m. Granite Polished no N/A Unpolished yes 300–400 sq.ft. 28–37 sq.m. SandstoneUnpolished yes 100–250 sq.ft. 9–23 sq.m. GFRC Smooth yes 150–500 sq.ft. 14–47 sq.m. SlateUnpolished yes 300–400 sq.ft. 28–37 sq.m. Repeated applications may etch surfaces. *For colored block, Sure Klean® Custom Masonry Cleaner may be more appropriate. Sure Klean® Light Duty Concrete Cleaner is a more suitable product. Sure Klean® Restoration Cleaner or Light Duty Restoration Cleaner may be more appropriate. Always test to ensure desired results. Coverage estimates depend on surface texture and porosity.