Do You want your new wood not to age? Then You can choose to treat thermowood with oil with UV protector or pigmented stain. Because this finish of wall cladding absorbs well into the wood, You generally get the best result with it. It is important to repeat the treatment periodically because graying can, unfortunately, never be completely prevented.
Re-oiling of the facade is required after approximately 5-7 years. A colorless oil contains no color pigments and therefore does not protect against UV radiation from the sun (greying). The pigmented oil offers protection against UV radiation from the sun (greying).