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Can anyone advise on thr correct preserver for a cedar wood greenhouse
Perceived wisdom usually states that western red cedar doesn't need a preservative due to its naturally occuring oils imbuing it with a level of rot resistance without our interference.
However, some people do recommend using either an oil treatment or spirit based wood preservative to help maintain its looks. you could perhaps look on the websites of cedar greenhouse manufacturers and see if they recommend anything, though I suspect that they may use a lack of maintenance as a selling point.
Perhaps it might be best just to leave well alone.
My house is cedar clad. never had anything put on it. Built in 1960