Ducksback Black 5LDucksback Black 5L Product information You can apply this shed & fence treatment from the Cuprinol 5 Year Ducksback range to , using a brush or roller, to colour and provide protection. It takes 2 4 hours to dry and will cover up to 5m per litre on average. Colours & weatherproofs Suitable for Wood Features and benefits Protection for 5 years Shower proof in 1 hour Non drip easy application Wax enriched water repellent Rich Colour Health and safety