Just for completeness I'll post this quite informative link, being a discussion of how some guys use vacuum setups to finish their  single shots for under water use:

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I didn't know for example that the finish is supposed to enter the wood as the vacuum is released, not so much when the bubbles are coming out, as the returning air pressure then pushes it in.

SSShooter wrote on Feb 8^th, 2017 at 7:41am:

.22-5-40
I can really sympathize here, I moved from Michigan to New Mexico a few years back. my whole collection showed signs of significant shrinkage in a short period of time. 200 yr old antiques and contemporary builds that where heavily sealed all where affected. several articles ie a 1790 blanket chest and a violin all split. now living in Montana....humidity here is about in the the middle of the last 2 extremes.