Q: I have a home with three large decks. I built the decks two years ago using Port Orford cedar and finished them with two coats of Cetol marine varnish. One deck gets moderate sun in the middle of the day and is shaded the rest of the time. Part of the deck is under an overhang and gets no sun. Last year I started seeing white material on the knots in the wood. When the deck is wet, they become invisible. It is only the knots that are in the sun, not the section under the overhang. The white material looks sort of like powder, but does not scrape off. I talked to the folks at the lumberyard where I bought the wood and the deck finish; they think it is resin that is coming from the wood and suggested that I sand it down and refinish it. I'm not quite sure how to sand down the knots as t...
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