Rainguard International CR-0205 Blok-Lok Ready to Use 5 gal Pail Penetrating Silane Siloxane Professional Grade Water Repellent Sealer - Concrete, CMU, Block, Brick, Stucco, Stone, Clear, Bottle 100 percent breathable water repellent for vertical concrete, brick and masonry surfaces Dries with a natural finish that will not yellow Protects against water intrusion, efflorescence, lime, spalling, freeze/thaw damage, stains, mold, mildew, and uv damage Eco-friendly, water-based, & made in usa Backed by FIVE year material warranty 100 percent breathable water repellent for vertical concrete, brick and masonry surfaces Protects against water intrusion, efflorescence, lime, spalling, freeze/thaw damage, stains, mold, mildew, and uv damage Eco-friendly, water-based, & made in usa Backed by FIVE year material warranty