Cuprinol One coat sprayable Forest green Fencing & sheds Wood treatment, 5L. This Cuprinol One Coat Sprayable Fence Treatment has been specially formulated to work with sprayers to colour and protect rough sawn timber in a fraction of the time. Its special pigments ensure a rich colour and even coverage in just one coat, so you spend less time treating your fence, and more time enjoying your garden.. You can apply this shed & fence treatment from the Cuprinol One Coat Sprayable range to , using a brush or spray, to colour and provide protection. It takes 6 hours to dry and will cover up to 3 m² per litre on average. Shed & fence treatment by Cuprinol.