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#1
11-22-2017, 08:46 PM
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Interior finish?
During a pause while playing, I glanced in the sound hole and a question came to mind. How come the interior wood is never finished? Or is it just a different type of finish than you get on the exterior? Is this where most of the humidity is lost or gained? Presumably the external finish acts like a sealer but I really don’t know. Thanks in advance.
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Lowden F32C Goodall RS Breedlove Concert Pursuit Taylor 814CE 
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#2
11-22-2017, 09:00 PM
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Some do some don't. Tradition says don't, or do, depending. The fact of the matter is that finish, at the film thickness acceptable for guitars (i.e. very thin), does very little anyway in terms of shrinking and swelling of wood, it's great for keeping wood clean though and it makes it look smashing.
Some builders think that a coat of shellac will help slow down drastic environmental changes, that may be true like if you fly from Reno Nevada to New Orleans for a gig, but it's negligible and as a counterpoint other builders think that the finish alters tone for the worse. You are gonna get a lot of back and forth on this question to the point where it doesn't matter 
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#3
11-23-2017, 07:47 AM
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finishing completely
I once asked this questions and got all the answers that seem to be missing so far. You could probably search and find it. My thought was that if the interior was finished, it would less affected by humidity changes. But I failed to consider that every layer of finish adds weight (and cost, since it takes time) and the heavier the finish, the less response and tone you are apt to get. Most builders did not feel it did any good, but it was not completely one-sided; there were a few nay-sayers.
And of course you are putting finish on a part that no one sees, a part that does not need the protection which finish affords.
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The Bard Rocks Fay OM Sinker Redwood/Tiger Myrtle Sexauer L00 Adk/Magnolia For Sale Hatcher Jumbo Bearclaw/"Bacon" Padauk Goodall Jumbo POC/flamed Mahogany Appollonio 12 POC/Myrtle MJ Franks Resonator, all Australian Blackwood Blackbird "Lucky 13" - carbon fiber '31 National Duolian + many other stringed instruments.
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#4
11-23-2017, 07:51 AM
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I don't really know but I am going to guess its the same reason they don't paint the inside of a barn. It doesn't need to be pretty.
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A couple of Halcyons and a Canadian made Larrivee "Wish I had more time to hear your reasons, but I have to go get a beer." 00-28 
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