The Seal-Once 1 qt. Clear Water-Based Waterproofer provides protection and stability, allowing the wood to age and gray naturally without decay. Water-based, eco-friendly and ultra-low VOC ensures the product is safer for people, pets and plants and is non-hazardous to aquatic life. Formulated to penetrate below the surface, creating a flexible and breathable barrier that expands and contracts with the elements plus protects against UV fading and water damage. Also designed for independent use as an end grain sealer. Use this water-based waterproofer to seal and protect up to 10 years on vertical surfaces and 6 years on horizontal surfaces.