Tuf-Top Hold Out

Inhibits mildew, algae, and water penetration. -Other water repellents are just that, water repellents. Hold-Out repels both water and biogrowth on concrete, stone and masonry. Chemically reacts and cross-links with concrete, stucco, pavers, roof tiles, and stone products to form a waterproof substrate. Will not weather and wash away as other products do. The water beading effect will dissipate the wear, but the integrity and repellent properties will remain. Retards mold and mildew formation on roof tiles, concrete walks and driveways. Keeps walks and driveway cleaner, longer. Because water cannot penetrate into the concrete, dissolved dirt and other materials cannot penetrate into the pores of the concrete. Wind and will will then wax the dirt off because it has not been able to latch to the surface. Helps to keep surfaces stain free. Because nothing can penetrate deep into the substrate, stains can be easily and thoroughly cleaned.

http://www.tuf-top.com/pdfs/HOLD_OUT_TECH_DATA.pdf