I have a 1987 fender MiA Strat with a maple neck. In a few areas of the fretboard, the finish has worn away and the fretboard is discolored. I am not going to get too anal about this but I want to just refinish those areas where the finish is gone. Any ideas? what did they use as the original fretboard finish in that era? I looked on the Fender site but couldn't find what I was looking for. I heard minwax polyshades polyurethane works well. Recommendations? How many layers? How much time should I expect this to take? Thanks all.