My exterior logs started showing a black sort of powdery substance on it. My home was built in 1990 and I've never had this problem. We use sickens stain and have stained faithfully according to the manufacturer guidelines. Help it looks terrible.
It is a black mildew that is growing under the stain. You will need to media blast, Osborne brush and apply a fresh stain. I recommend LifeLine Ultra 2, Capture/Cascade or Nature's. Call Dave at 800-564-2987 for help and the materials you will need.Share on Twitter Share on Facebook