Cuprinol Wood Preserver Clear (BP) is a colourless general-purpose preserver for interior or exterior use. It gives deep penetrating protection to sound wood against decay, mould and blue-staining fungi. This low odour formula has been specially developed with low aromatic solvents to make it more pleasant and convenient to use. Colourless preserver for intense use When used for exterior wood it must be overcoated with a stain or a paint Actively protects against rot, decay and blue staining mould Solvent base formula aimed to meet the needs of more traditional users The 1L can covers up to 5m with 2 coats. The 2.5L can covers up to 12.5m with 2 coats. The 5L can covers up to 25m with 2 coats. Coverage can vary depending on application method and the condition and nature of the surface.