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Varathane® Crystal Clear Spar Urethane Spray offers outstanding UV and weather protection. Use this outdoor-approved clear sealer from Rust-Oleum® to add years to the life of exterior wood projects. This water-based spray is low odor and comes in a 11.25 ounce aerosol can so you don't have to worry about brush strokes marring your satin finish. Apply a minimum of 4 coats for best results.