I'm going to be getting a fretless witha rosewood fretboard. I plan on using SIT Bass Silencers which I know won't chew up the fretboard as much as regular rounds, but will probably do some damage. I know people epoxied their boards, but I don't want to do that. What about using polymerized tung oil? Would that build up the hardness of the board so that rounds don't do damage to the surface? How would that affect the tone? Any other ideas for protecting the fretboard?