Teh beeswax should work, I've done emergency jobs on melodeons with the wax on the outside of Edam cheese.

There may be a melting point problem as you suggest but I wouldn't hink if carefully used and once inside an instrument most amateur luthiers are more careful than professionals I suspect itwill not do any harm.

Personally i woudl try it.

As for damp - wher eis it coming from - if damp climate then nothing you can do other wise storage - silica packets in the case and refresh them in a hot dry oven frequently!

I get worried in summer with fidles sat int eh abck of an estate wagon and wrap them in extra thermal sleeping bags!!!! Neccesity is the mother of invention. I wish I had a 2 year old accorsion mines about 50 but it still does the job I suppose.

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