ICT 160-5G 5 gal Water Shield H2O with Stain Guard Water Repellant is a water-based, penetrating water-repellent designed to be used on most properly prepared concrete or masonry surfaces, as well as roof tiles. Water Shield H₂O will create a hydrophobic barrier while still allowing for full breathability to disallow any intrusion of water or contaminates carried by water to enter the substrate.