Hair line crack bottom back of walnut McSpadden
Instruments- discuss specific features, luthiers, instrument problems & questions
I did hear back from Jim Woods and he said that those were superficial and in the wood all along. It was not a result of damage and will not get worse. If the dulcimer was unacceptable to me, he would allow me to keep it until another one was made and shipped to me. I told him that I love the sound and wanted to keep this dulcimer instead. When asking about varnish, he told me that I didn’t need to do anything to that area of the dulcimer. If I wanted, I could use furniture polish that did not contain silicone. Old English (in the bottle) would be fine. Jim Woods of McSpadden Dulcimers was really helpful. Thanks everyone for your input, too. I have been playing the dulcimer less than a year and still have a lot to learn about these wonderful instruments!

! You need to ask McSpadden what they use for "varnish" -- it could be any number of things like polyurethane, varnish, shellac, various oils.