5-Gal. SX5000 Penetrating Clear Solvent-Based Silane-Siloxane Concrete & Masonry Sealer, Water Repellent, Salt Guard Penetrating (2") Solvent Based Silane/Siloxane Water Repellent. Interior/Exterior. Superior efflorescence and strong alkali resistance. Stops concrete dusting. Resists damage cause by de-icing salts and freeze/thaw cycles. Lasts up to 10 years and won't change the look of the concrete. Provides excellent resistance to mold, mildew, and fungus.