Just one application of Rutland Chimney Shield Water Repellent can provide any masonry chimney with lasting protection against moisture and freeze/thaw damage, The secret of this water repellent"s effectiveness lies not just in its ability to block liquid water, but in its ability to allow water vapor to escape rather than become trapped against the chimney"s surface where it could cause deterioration, Safe for use on brick, concrete, stone, and stucco chimneys, Effective water repellent for masonry chimneys, Protects against spalling and freeze/thaw damage, Unique formula blocks liquid water while allowing water vapor to escape, Safe to use on brick, concrete, stone, and stucco, Completely transparent and non-flammable, Cleans up with just soap and water, Can be applied with any low-pressure sprayer, 10-year limited warranty, Soft Brick: 100-150 sq, ft, per gallon, Hard Brick: 175-225 sq, ft, per gallon, Stucco: 100-200 sq, ft, per gallon, Concrete Block: 125-175 sq, ft, per gallon, Natural Stone: usually 75-150 sq, ft, , depending upon porosity, SKU: RTLD317