Protect the beauty and integrity of exterior surfaces with Old Masters Ascend Exterior Water-Based Clear Finish. Ascend Exterior is a clear, durable finish designed for exterior application on wood or painted wood surfaces and contains ultraviolet absorbers for advanced sun protection. Use on adequately prepared exterior wood surfaces, such as railings, outdoor furniture, above waterline marine surfaces, and doors including wood, fiberglass, and steel. It can also be used on interior windowsills and door frames for added ultraviolet protection. Please do not use it on wooden decks, steps or fences, wood siding, log homes, or surfaces below the waterline.