Osmo UV Protection Oil Extra 420 750ml Osmo UV Protection Oil Extra 420 is especially recommended for the treatment of timber cladding, roof overhangs, balcony elements, garden furniture, windows and doors etc. Key Benefits: • Protects the wood against mildew, algae and fungal attack • Maximum 2 coats on raw wood, 1 coat for renovation applied to a clean and dry surface. • 1L covers approx 24m2 per coat.