SEAL-ONCE Clear Waterproofed provides protection and stability for exterior wood that finishes and performs as well as an oil base. Water based, eco-friendly, and LOW VOC ensures the product is safer for people, pets, and plants. Formulated to create a flexible and breathable barrier that expands and contracts with the elements, stabilize against water damage and decay, and dry clear. Also designed to be effective on thermally modified wood and tropical hardwoods. For use on decks, fences, and siding.