Minwax Helmsman spar urethane is specially formulated as a protective clear finish for exterior or interior wood exposed to sunlight. Urethane-fortified alkyd resin formulated to dry to hard but not brittle finish. Tougher than polyurethane; more resistant to checking, chipping and cracking, able to withstand greater shock impact and dramatic temperature changes and less likely to yellow because it contains UV absorbers. Scratch-resistant and faster drying. Approximate coverage 100 Sq Ft per Quart.