"Unlining" a lined fretless.

[MoonBassAlpha]

I've had a fretless neck done with black lines. Pretty much invisible from a distance against a rosewood (actually, pao ferro) board. Carefully applied Sharpie would achieve similar temporary effect.

[oldslapper]

Bought a bitsa jazz with unlined warmoth neck in the end.
Thanks for all the suggestions.
John

Here's some details http://basschat.co.uk/forum/19-basses-for-sale/

Edited July 21, 2017 by oldslapper