I use "wipe-on"polyurethane and a rag (piece of old "T" shirt) on most of my projects. I wipe on a coat, let it dry (4-8 hours) lightly sand with 600 grit paper and wipe on another coat. Yes, even wipe-on finishes get air bubbles and dust nibs.
After about three coats, I "sand" with brown paper bag and rub on a coat of Minwax paste wax.
I realize that this wont work on fret work very well but, then who handles fret work and few people even notice the finish on fret work anyway.
I use this method for boxes, bowls and vases mostly as people tend to want to pick them up for inspection.
Rog