Barrettine Clear Universal Wood Preserver provides a colourless finish as a primer for further overcoating with paint or varnish. Can be used on untreated wood or treated timber outdoors and also for use on windows/frames, external doors/frames (internal & external sections). Can also be used on structural timbers in indoor unoccupied areas such as floor joists. Barrettine Clear Universal Wood Preserver is a ‘colourless’ high-quality, low odour oil/Spirit wood preservative that is deep penetrating. This wax-free primer Wood Preservative is used for wood protection against wood-destroying fungi (wet rot), wood discolouring fungi and wood-boring insects.