Deck-O-Shield is water repellent, water-based sealer. Ready to use, Deck-O-Shield is designed to use as a sealer/water repellent, perfect for natural stone, concrete, and masonry surfaces. Perfect for waterfalls and other uses around the swimming pool. This product can also be used as a sealer/water repellent for natural stone decks, copings, walkways or patios. Once treated with Deck-O-Shield, the surface will inhibit the penetration of salts into the surface, reducing “whitening” or staining. Deck-O-Shield provides a matte finish to the surface.