In addition to violating the "no extra, unnecessary weight" rule of thumb, the inside-sealant/finish idea contradicts what I was told from numerous sources when I was learning to build: that a guitar wants to breathe, and that we want the liquid and semi-liquid contents of the wood cells to either evaporate or solidify over time. I'm no wood scientist, so I don't know if the above is true, but I picked it up from numerous sources, since it's not illogical to ask "if finishing the outside is good, wouldn't finishing the inside be good too?"
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