I built a wind mill for our back yard out of what Lowe's calls cedar. It is really fir/cedar for fencing.
My first one, I did not finish at all and it lasted 4 or 5 years until the wind took it down for the last time this spring.
My second one (at the request of my wife) I put a coat of shellac on and it is keeping the color better. I know it will not last but, I really like the silver/grey color better anyway. It will split as it dries out as well as change color but, I anchored this one down much better to fight the Kansas winds.


Rog