Hey guys! I'm going to be purchasing a fretless soon (my first) and moving from a fretted 4 string to a fretless 5, I was wondering if any fretless players have ever heard of doing this. A friend of mine said he bought this thin white tape that didn't leave a residue to mark fret lines on his Cello neck when he was learning how to play fretless way back when. I was wondering if anyone knew of such a brand of tape, or just plain old type of tape that would work for this. Thanks!