fixing crack(s) in ebony fingerboard

Discussion in 'Luthier's Corner' started by pnutz, Oct 15, 2017.

  1. pnutz

    pnutz Supporting Member


    need to patch up / fill a crack in an ebony fingerboard. read online that ebony dust and super glue would do the trick. so does one mix the glue and ebony dust together and then apply that 'paste' to the fingerboard? or does one put the ebony dust in the crack and then fill it with the super glue?

    if you have any tricks, tips, or techniques to pass along, i'd appreciate it. thanks! :)
  2. MPU


    Sep 21, 2004
    Valkeala Finland
    I put dust in the crack, then superglue. If you mix dust and superglue it will cure in seconds. There’s no time to apply the paste.
    Gilmourisgod likes this.
  3. pnutz

    pnutz Supporting Member

    so fill crack with ebony dust and apply glue.

    i'm sure some sanding will be involved to knock the super glue down. any suggestions on grit? definitely don't want to sand down the radius of the fingerboard. should i go light?
  4. MPU


    Sep 21, 2004
    Valkeala Finland
    Use masking tape to mask the board so that only the crack is visible. Fill, let it cure and sand with fine (I’d use 400 with something hard as backing block) paper, then finish with fine synthetic steel wool on micromesh.
    Gilmourisgod and mikewalker like this.
  5. Also, if the crack is deep, fill about a third with dust, add a few drops of superglue, give it some time to cure, do the next third, repeat as needed.
  6. pnutz

    pnutz Supporting Member

    Just received my package from stewmac (super glue tinted black and hopefully enough ebony to grind to dust). Any last tips or tricks of the trade before I get to it? Was planning to start small first to see if I don’t mess things up. Thanks for the info and help!
  7. FunkHead

    FunkHead Supporting Member

    Mar 10, 2007
    How did this work out?
  8. pnutz

    pnutz Supporting Member

    hehe.. forgot about this thread. yeah, everything worked out. would post pics but the neck is currently at a local luthier's shop being 'frankenstein'd' with some parts i've accumulated.

    FunkHead likes this.
  9. Rôckhewer

    Rôckhewer Supporting Member Commercial User

    Feb 28, 2015
    Phoenix, Arizona
    Owner/Builder- RockHewer Custom Guitars LLC
    In case anyone interested...
    The above idea of filling the crack with dust (dry)...first... then wicking in CA...?
    ... works well...
    but ONLY with THIN viscosity CA glue.
    If using the "medium" stuff $tewMac sells....
    I would build in thin layers, glue first... then dust.
    Gilmourisgod and Beej like this.
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