Shrinkage in finished items
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Q: We've had some shrinkage problems with our finished items. How can this be?

A: A finish slows the moisture movement, but doesn't stop it. Multiple coats of some finishes provide better protection (better slowing) than other finishes.

If the initial MC is incorrect, a finish will not prevent moisture related problems. Incidentally, a slow uptake or loss of moisture is less of a problem than a rapid increase or loss. However, many finishes are so thin that they do very little good at all in slowing the moisture change.

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About the author
Gene Wengert

Gene Wengert, “The Wood Doctor” has been training people in efficient use of wood for 45 years. He is extension specialist emeritus at the University of Wisconsin-Madison.