I asked this on UMGF and nobody bothered to answer (sniff sniff). Here's the deal. I have an old Harmony 1213 Archtop that has developed a few rattles and on crack in the top over the years. I removed the back and reglued the braces, all of which were loose. I also grooved out the top crack and cleated it. The wood on this guitar is way dry. Understandable as it was made in '51. It's not a humidity issue as my guitar room is kept a 45-50% RH year round. But the wood is way dry.
I was wondering if I should put a light coat of thinned boiled linseed oil on the wood inside the body to rejuvinate it some. I realize that a lot of the tone (which is very cool in this guitar) comes from it being old and dry, but I can live with a little loss of tone. I just don't want it to crack or crumble into dust. Advice?