I just bought a birch butcher block countertop from Home Depot. The instructions (https://www.homedepot.com/catalog/pdfImages/71/71b1d057-7ed6-4336-a063-fb816fb7110c.pdf) states that "the butcher block MUST be sealed or finished on all surfaces within 48 hours of removing shrink wrap."
Any idea why this is? Is it to prevent warping of the wood? To prevent moisture from getting into it?