Anyone know why they say not to do this to a the maple fretboard as well? I never understood that since it's all the same wood. Seems like it would be a good idea to seal the board too.
Not to do it to a
varnished/lacquered maple fretboard! Many other guitar brands' maple fretboards are lacquered, just like the rest of the neck is. The oil/wax treatment (and Wonder Wipes Fretboard Conditioner) will do nothing useful for finished neck and fretboard and will only make a big mess to be cleaned off.
Re: oil/wax, here's some notes based on my experience and past forum posts...
Back in knucklehead factory tour days, someone witnessed the magic factory oil/wax treatment. It was literally, wipe on, wipe off, no drying required. That's certainly been my technique and works great.
Only use a enough oil and/or wax to lightly and evenly coat the neck, avoid the temptation to use a lot. Remember, you can always add more but too much just a makes a mess to clean off, especially if you leave it dry. Some people have applied tons with their fingers and let it dry, resulting in a sticky goopy mess that had to be sanded back and re-done. Remember we are not applying the oil and wax as a finish, the way people would do on gunstock or a guitar body. It's more of a light protective surface treatment, that's all.
Those two last point above are why I personally don't recommend leaving it to actually fully dry. There is really no need. Small amount on a paper towel, wipe evenly over neck, buff off with fresh paper towels. Result is neckular loveliness.
Some people use just Tru-Oil, some people use just Gunstock Wax, some people use Tru-Oil followed by Gunstock Wax. All produce good results.
600 grit sandpaper does a great job all on it's own. If you have 1000 or 1200 grit sandpaper great. Following with 0000 steel wool is better again but not necessary.
Wonder Wipes fretboard conditioner works great on any unfinished wood, though the wipes are quite 'wet' and there is a lot of excess to wipe off, especially on less porous woods like maple and ebony. Don't use Fretboard conditioner wipes on lacquered necks, fretboards, or bodies. It'll make a mess.
Wonder Wipes instrument Polish is great on lacquered/varnished necks and fingerboard, just as it is for the body. Compared to the Fretboard wipes, instrument polish wipes seem very dry. That's normal and they'll work great.