I'm sure this has been brought up before, but whatever. I've been playing a bit of fretless bass for a few months now on a Samick 5 string with rosewood fretboard. Does anybody have suggestion on how to line a fretless, without having to inlay the lines. The purpose is to have lines while I'm improving my technique and to remove them (simply put) when I'm done. Not only for the appearance of the bass, but also for not getting confused once I know where everything's at. It's ok if they wear off a bit, since I plan to remove them anyway after, say, a year. So, paint, chalk, other stuff?