Ascend Exterior Water-Based Clear Finish is a durable coating designed for exterior application on wood, fiberglass, coated metal, or painted surfaces. It contains ultraviolet absorbers for advanced sun protection, dries quickly, and cleans easily with soap and water. Use it on adequately prepared exterior 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 ultraviolet protection. Please do not use it on wooden decks, steps, fences, log homes, or surfaces below the waterline.