So when I bought my bass, I cleaned the nasty stuff off the fretboard from the previous owner and took off the finish a bit from aggressive cleaning. I think it was just oiled finish anyway on a natural maple fretboard.

I'm rebuilding it this weekend, new strings, pickups, pots and bridge. Bought some shellac to refinish fretboard but think that might be too soft and not the right stuff. Wavering between just mineral oil or tung oil. What are your thoughts?