I've got a Roscoe with bad fret sprout due to the dry winter environment here. Winter time means furnace heating and low humidity. I understand why sprout happens, and how to knock down the exposed fret ends with a flat file, but what about the neck finish? To take the fret ends down flush with the neck I'll have to kiss the finish just a bit with the file. For those who have done this before, how do you touch up the finish? Wipe on poly? Wax? I'm planning on finding a local luthier to do this repair, but want to understand the process and how it is normally done. I'm concerned the edge of the neck/fretboard will be bare wood and end up getting dirty and grey looking over time. This kind of mojo looks cool on some of my older basses, but this roscoe is a real looker and I'd like to keep it that way.