Varathane Outdoor Water Based Spar Urethane is designed to provide excellent protection for all your wood projects. Varathane Outdoor Water Based Spar Urethane is formulated to provide protection from UV light and weather. It is ideal for all types of outdoor projects, including outdoor furniture, doors, windows, fences, railings, house trim, and boats (above the water line). It is crystal clear, odorless and provides for easy water clean-up. It is not recommended for decks or high traffic areas, siding, or rough-sawn surfaces.