Osmo UV Protection Oil has been developed to maintain the wood's natural colour and slow the greying process. Ideal for windows, doors, cladding, fencing and other vertically structured joinery. Natural oil-based and micro porous finish does not crack, flake, peel or blister. Water and dirt resistant, moisture regulating and reduces wood swelling and shrinkage. Enhances the natural character of the wood. Contains biocides to protect against algae, mildew and fungal attack.