On the instruments I build, (for what it is worth) I get the shape and size and feel of the neck exactly right, then sand with 400-grit, then wipe down with coffee, simultaneously raising the grain and adding a small amount of color. I allow that to completely dry, then sand with 400-grit until it is again silky smooth. I repeat the wipe-down with coffee/dry/sand routine until the grain no longer responds to the moisture at all. I have never had this take more than three attempts..usually two is enough.
Then, with the neck silky-smooth, dry and stabilized, I use a rag on my finger, with just a "finger-tip-full" of shellac, and rub all over the neck, polishing hard, until it is hard and dry and glossy-smooth. That seems to produce a lasting, smooth, pretty-much sweat-resistant finish.