SEAL-ONCE All Wood Brightener is designed to brighten and neutralize wood after cleaning with SEAL-ONCE Multi-Surface Cleaner. For use on exterior projects such as: docks, decks, patios, fences, and outdoor furniture. The concentrate formula makes up to 4 gallons and covers up to 700 square feet. The product can be used on hard and soft woods, pressurized lumber, and Brazilian hardwoods, and withstands harsh environments near open water.