UV-Protection Oil from OSMO is a specialized product designed to protect exterior wood surfaces from the damaging effects of sunlight.  Revolutionizes the preservation of exterior woods by slowing down the natural greying process by 12 times compared to untreated wood. While wood colour naturally fades over time, this product maintains the original colour for a longer duration. Ideal for windows, doors, cladding, fencing, and other vertically structured joinery. This product is not recommended for flat surfaces such as decking.