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Q.Is it possible for wood to be too wet for polyurethane glue?

A.You can expect polyurethane glue to cure properly in woods with a moisture content of up to 25 percent. Moisture has to be present for polyurethane glue to cure, so the moisture content of the wood to be glued should be at least 8 percent. While there is no upper limit per se for the glue to cure, I’d avoid gluing wood with a moisture content higher than 25 percent, regardless of the glue. Wood with such a high moisture content will shrink appreciably, and the chances of joint failure are high.

— J.J.