Good day! I'm currently in the process of building my own fretless bass. Now i want to do this right all the way, so i need your help/expertise please... The problem is that I don't want to make any cut into the fretboard (which is coromandel), but fretlines are needed because it's a multi-scale bass Now the question is: how can i still make lines visible on the fretboard? My first thought was 'bleech it', but i guess the wood would soak it up and make a smudgy spot instead of a thin line. Maybe a thin line of paint,a first layer of laquer and then sand them flat? Every thought is appreciated.