Thompsons WaterSeal Waterproofing Stain provides complete outdoor wood protection. Shows the medium wood grain while adding subtle color to the surface. Prevents water damage. Advanced polymers provide fade resistant color. Coating resists mildew and UV damage. Applies to freshly cleaned damp or dry wood. Exceeds industry standard ASTM D-4446 for waterproofing wood. For use on decks and fences, outdoor furniture, and exterior wood. Solid. Size 1 gallon.