I have two MIM Jazzes. One was originally fretless, the other is a fretted. I coated the fretless neck with some sort of polyurethane spray (multiple coats) but even when it cured the finish was still really "soft" and there are a few permanent indents from when I pressed a string too hard into it. I was thinking on defretting the fretted Jazz (I defretted an old precision a while back, so I have some experience) but I don't know what kind of finish to put on the neck once defretted and the slots are filled with wood putty. Any good recommendations?