Cuprinol UV Guard Decking Oil can be used to penetrate into wood to replace natural oils and resins lost through weathering. Its tinted formula revitalises the colour of weathered wood. How much do you need? A 2.5L can covers up to 20m with 2 coats brush applied A 5L can covers up to 40m with 2 coats brush applied or 1 coat spray applied. Coverage can vary depending on application method and the condition and nature of the surface. Colours Natural. Natural oak. Natural Pine. Natural cedar.