Hi Dylan, if you want a typical Fenderish lacquered fretboard just use the same finish all over the neck......clear acrylic spray or maybe something with a slight amber tint, or maybe Tru Oil. Never used Tung Oil but believe it can also do a good job. For a more satin finish there are furniture polishing waxes that you could use. Ozzbike has used Gillys......https://gillyswaxesandpolishes.com.a...makers-wax-cmw and it looks great.
Cheers, Waz