Texcrete Silicone-based Water Repellent is a clear, water-repellent sealer that produces a breathable barrier on masonry. This barrier prevents chlorine penetration and reduces cracking, dirt pickup, efflorescence and damage from freezing/thawing cycles. Because it is clear, the sealer penetrates deep into substrates without changing their appearance. Recommended for both interior and exterior surfaces Clear, invisible barrier Protects vertical and horizontal surfaces Alkali resistant Odorless Non-flammable VOC compliant Five Gallon Pail Coronado Paint Co