Armor SC25 Concrete, Brick, and Masonry Water Repellent Sealer Can be used on existing concrete and masonry, as well as concrete less than 28 days. Won't change the look or color of the concrete or masonry, won't leave a slippery surface film. Great for use on fiber reinforced concrete, white concrete or light concrete. Will provide up to 10 years of life before the need for a recoat. Can be applied with a garden sprayer. Requires only a single coat application.