Most Fender maple necks are finished in Polyurethane. Older Fenders (CBS) are polyester. The vintage and custom shop versions are Nitrocellulous lacquer.
If I were doing it, I would use Nitrocellulous Lacquer for the back of the neck and the headstock. I'd oil the fretboard (that's what I like). For re-sale, I'd do the whole neck in nitrocellulous lacquer.
Shawn
"no trees were harmed in the creation of this message, however some electrons were temporarily inconvenienced."
"I resent having to use my brain to do your thinking"