hi, 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!