HELP! Our clear cedar is turning black, we built the home 10 yrs ago. Used Sikkens Cetol 23 plus, applied 3 coats to front and back of the boards and then installed them on the house. Have reapplied Cetol 23 plus every other year since. Why is cedar turning black?? And what can we do to fix it?

waterloop Changed status to publish April 2, 2024