| Any solid substance of the right thickness will fill them. I'm the guy who used white styrene, which has advantages...
1) You can buy it in a specific thickness
2) After you get it glued in place, it's easy to trim the excess with a razor blade (try THAT with flat aluminum or brass sheet stock...)
3) When finish sanding the fretboard, it sands the same as the wood, making it easy to get a nice finish.
I bought a craft saw with a blade .022 wide to clean out the slots left by the frets, then used .020 thick styrene to fill them. I thought about using wood, but getting wood in that specific thickness would have been a real pain....and I'd have no idea where to find it. I know that I can't saw wood that thin with the equipment I have.
Seems to me that if you want a harder-to-see filler, epoxy would be fine since it's denser than the rosewood, so it wouldn't compress. But it's certainly a one-way street. Once you want that route, you couldn't go back. And I think metal stock would be a nightmare to work without damaging the fretboard.
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"Ya know what old Jack Burton sez at a time like this? Old Jack sez....'what the hell.'"
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