Liquid biocidal agent – primer, water-based, for wood treatment, for preventive protection. It contains active substances that provide effective protection of wood against wood-destroying mold, mildew that provokes the discoloration of wood, and insects that attack wood. BK-Protecta primer very easily penetrates through the pores of wood, thus protecting the deep layers of the wood. This product regulates the moisture content of the wood and ensures good adhesion of subsequent coatings. The coating can be applied on wooden surfaces outdoors that are not in direct contact with soil or water. It is suitable for use on wooden façade surfaces, joinery (internal and external parts), wooden garages, blinds, and fences on terraces. It is odorless after drying. The product should not be used for treating wood indoors.