I have thick, medium, thin and very thin superglue……
For fret filling I use the thin – the thinner it is the easier it ‘wicks’ – that also means that it can go everywhere…….

@Tej I use thin superglue and only add small drops – the drops vanish down the slot, usually by the time you get to the end of the fretboard you can go back to the start…..

Superglue works – you do need to apply it in 3 or 4 passes on end side then when dry do the other – too much at a time and it will run down the fretboard and then it takes…   Read more»