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Installed a knotty pine outdoor porch ceiling a few years back. I put on a couple of Coates of semi gloss sealer and it needs a couple more coates this summer. There is a few minor spots of mold starting to develop. Can I power wash knotty pine? Should I sand moldy areas? If so What grade sand paper? Thanks!

You definitely want to get rid of the mold. Unfortunately it is probably under the old finish. You can LIGHTLY power wash and if sanding is needed use 50 or 60 grit paper.

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