Re: Cracks due to "drying out".
I agree that finishing the inside would not help much, if at all, but I did own a flat top mandolin by the late Walt "Gypsy" Kuhlman, and its interior was shellacked. I asked him why, and he said it was to control the escape of moisture. He also added that it was an "Old World" technique. That makes me wonder if anyone else here has encountered a European made instrument with interior finish.
Don
2016 Weber Custom Bitterroot F
2011 Weber Bitterroot A
1974 Martin Style A
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