Once they are tapered and have the dots installed they must be sanded perfectly smooth.
See all those little lines from the thickness sander on the right hand fretboard. They all get sanded out
Did you notice the little worm holes in these fretboards. worm holes are commonly found in the South American Rosewoods. But not to worry, there is a simple trick to solve the problem.
You simply put a drop of thick superglue in the worm hole like this.
Then you vigorously sand over the wormhole which mixes saw dust with the superglue and when the glue sets up the worm hole has virtually disappeared. An old trick of the trade, as least it is as old as super-glue.
Next, with a tiny drill bit you drill a hole in the fret slot of the first and next to the last fret. These will hold indexing brads when you are ready to glue the fretboard to the neck..
Now it is time to press in the frets. A little glue, a tap of the fretting hammer and then into the press for the final setting.
Now you can set the fretboard in the perfect position, Tap down the brads to mark that position on the neck and you are ready to glue. Add the glue and the brads will guide you right back to the perfect position. I will put those last two frets in later.
Now the glue is applied and the fretboard is clamped to the neck.