Osmo Natural Oil Woodstain 732 Light Oak 2.5L Exterior Wood Protection Innovative and durable protectionOsmo Natural Oil Woodstain is a decorative, oil-based protective finish for exterior wood. The microporous, breathable finish allows the wood to breath and reduces the risk of swelling and shrinkage. Water repellent and extremely weather and UV resistant. Contains active ingredients which protect from mould, algae and fungal attack. Proven finish over decades in all kinds of climatic conditions, does not crack, flake, peel or blister.