Cuprinol Exterior Wood Preserver (BP) is an exterior lightly pigmented wood preservative for rough sawn and smooth garden timbers, such as cladding, fencing, sheds, greenhouses and summerhouses. It contains active ingredients that penetrate into the timber to prevent rot, decay and blue stain. It is a water-based product that can be used near plants. Features & benefits Gives long lasting protection against weather, rot and blue stain Quick drying Water based Drying time - 2-6 hours depending on the nature of the surface and the weather conditions