What do you use..

[fscotte]

... to fill the gap under the frets on an unbound fretboard?

I've used black super glue, and glue and ebony dust. Just wondering if theres any else I havent thought of...

[Marty Jacobson]

... to fill the gap under the frets on an unbound fretboard?

I've used black super glue, and glue and ebony dust. Just wondering if theres any else I havent thought of...

Those will work. Or you could cut a strip of ebony and put it on the edge of the fretboard similar to binding, nip the tangs, and have a nice edge that way. Since I use CNC I cut the slots about 1mm away from the edge of the fretboard, then nip the tangs.

[rcc56]

If you're a builder making your own boards, reduce the depth of your fret slots.

I repair only, I do not build. When I refret, extra depth is usually not a problem-- when the board is re-profiled, a few thousandths are lost. When I recut the slots, I set the Dremel to just slightly deeper than the height of the tang. Then I drive the frets with liquid hide glue. Rarely is there any significant left to fill.

You could burn in with a black shellac or lacquer stick-- that was pretty common in the old days.

[fscotte]

Ah I like the idea of something like a lacquer stick.