I picked up an upright at a flea market that plays reasonably well, however I get a buzz on the "A" string if you press down about an inch below nut that continues until you are about 3 inches below the nut, at that point the string is fine. When I look closely it appears that someone took off too much wood on the fretboard as you can even feel a slight dip in the wood below the "A" string that goes on for about 1.5 inches. If I put 4 sheets of paper between the string and the fretboard to simulate the board being just a tad thicker the buzz goes away.
So my question is whether I would be possible to apply a thin layer of epoxy that you would use to make fiberglass repairs on the deep... I'm guessing my other option is to lower the fretboard from the dip all the way down, but that would seem to be a lot of work for what appears to be just one tiny 1.5 inch problem. Has anyone ever tried this?