Polyurethane

-CB-

Senior member
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Its more of a shrink in, and yes all finishes shrink to some degree.  Finishes like lacquer and shellac do it to a greater degree, since they are evaporative finishes, where solvents escape for the finish to dry.  Most urethanes cure by oxidation (or by chemical catalyzation) and will shrink, but much less.
 
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