Ronseal Ultimate Protection Dark Oak 5L is a high-performance exterior wood protection product designed to keep decking and other outdoor timber looking great while offering long-lasting defence against the elements. This 5-litre container of dark oak finish highlights and enriches the natural grain of the wood with a rich, deep brown tone ideal for enhancing outdoor spaces. The formula provides weatherproof protection, helping to guard wood against greying, splitting, scuffs and everyday foot traffic, and it becomes rainproof in just 90 minutes once applied. It is suitable for use on both hardwood and softwood decking, and when applied in two coats with a brush or decking pad, it can cover up to around 8 m² per litre of wood surface. Thanks to its water-based composition and low VOC content, it dries with a matt finish that accentuates the wood’s natural beauty while offering robust protection that lasts significantly longer than standard wood stains.