Designed for exterior wood applications, EXTERIOR 450 varnish provides your wood with a tough, protective outdoor water-base wood finish that will withstand the rigors of the sun, rain, and wind. Can be used as a tint base to create custom colors. It is suitable for fences, patio furniture, garage doors, entrance doors, outdoor kitchens and interior windows. It is not recommended as a deck finish. Fortified with UV absorbers to help minimize fading and maximize performance, Exterior 450's built-in mildewcide retards mold and mildew growth. Tough and flexible, it will resist the expansion and contraction of the wood through hot summers and cold winter. Warning: We do not recommend Ext 450 stains or topcoats for exotic woods Ipe, teak, or other dense oily woods that will get exposure. Exterior 450 can amber over time.