System Three Spar Varnish - Satin - Quart is a high solids spar urethane varnish specially formulated for marine and exterior surfaces. It is i for use on boats, outdoor furniture, doors, or any surface where a clear satin finish is desired. This varnish contains ultra-violet light absorbers that provide excellent protection against sun damage, salt air, and water exposure. It is resistant to boiling water, hot lubricating oils, and many cleaners and solvents, ensuring durability in harsh environments. One quart covers approximately 350 to 450 square feet, making it an efficient choice for your protective finishing needs.