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realize that an unfinished board can warp just by laying on a tabletop for a day. moisture can come and go on the exposed surface, but not the surface underneath against the table. this difference in moisture from one face to the other can cause warp - quickly. flip the board over and it will often come back.

even though it dried in the barn, if you brought it indoors, there is a climate difference.

also the same reason you want to always finish both faces of a project with same amount of sealer.
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