There are a number of exterior wood oils that contain UV filters and stabilisers that are designed to act much like a sun tan cream does to skin. Exterior wood oils such as Osmo UV Protection Oil Extra help to block moisture and UV rays that strip the natural tannin and pigments from the timber. Although these products greatly slow the greying process, they do not stop it completely.
Products such as Osmo Wood Reviver Gel (6609) can help to restore the natural colour of timber. This said, the process involves scrubbing the gel into the cladding and rinsing off with lots of water after around 15 minutes. This may not be practical for large areas of wooden cladding. An alternative is to use a coloured or pigmented UV resistant exterior wood oil to restore the colour such as Osmo UV Protection Oil Extra.
In simple terms yes but we would always recommend using a dedicated exterior wood oil over traditional oils such as Danish Oil or Teak Oil. Specialist exterior wood oils are formulated with a blend of oils, resins and UV filters that offer better durability, longevity and protection from Sun and weather damage, making them ideal for wooden cladding. These products tend to be available in both clear and coloured formulations so if cladding has been left untreated for a number of years and has turned grey or silver over time, the appearance can be restored.
Wooden cladding can be made from different wood types, Some such as Red Cedar are more resistant to weathering than others. This said, all woods slowly loose there natural oils becoming dry and brittle over time. For this reason we recommend that all cladding is treated with 2 coats of wood preservative followed by 2 coats of a suitable exterior wood oil, preferably prior to installation and on all sides and ends. This helps to keep the wood protected from mould, algae and insect attack as well as keeping the wood supple and weather resistant.
For the best overall protection, we recommend that wooden cladding is treated with a wood preservative and wood oil before being installed. Ideally, both sides, edges and cut ends should be treated with 2 coats of wood preservative followed by 2 coats of an exterior wood oil. To do this will likely take several days to allow the recommended drying times between the 4 coats but will be worth it in the long run.