Barrettine Universal Preserver is for outside use and for use on windows/frames and can also be used on external doors/frames (internal and external sections).
It can also be applied to structural timbers in unoccupied areas like floor joints.
Universal Preserver Clear is a deep penetrating, good quality, low odour and solvent based preserver which is used for the protection against wood destroying fungi (wet rot), wood boring insects and wood discolouring fungi.
Universal Wood Preservative produces a semi-transparent matt / satin finish which shows off the natural wood texture. No top colour is needed unless it is for aesthetic purposes.
Try using Barrettine Wood Protective Treatment to protect exterior wood against weathering!