by stephen » 11 May 2014, 16:25
Of all the colours, black (OK I know that black is strictly NOT a colour!) is the easiest to effect a finish repair on. You're also fortunate in that the ding is on the back of the headstock and not the front, so it'll only be you that's ever really looking at any repair when it's being played!
I'm a bit fussy as well, when it comes to having chips, dings, dents etc., on my guitars and the whole relic business, whether artificial or genuine is a bit of an antithesis to me. Some years back, I picked up a used 40th Anniversary 1954 Stratocaster at a music show, which had a few relatively minor dents in the outer, virtually 'black ' areas of its two-tone sunburst finish. Around that time, Gibson were producing some nifty touch-up pens in black, clear, amber and cherry and I was able to borrow a black one from a luthier friend.
Over a period of a few days, I built up the surface of these dents by dabbing (NOT painting) the lacquer into them until it was just proud of the surrounding surface. After allowing several more days for the new lacquer to harden off, I then carefully sanded it flush with the surface using a few of the finer grades of wet or dry abrasives (used wet) wrapped around a small, flat rubber block. I know it gets a bit scary when doing this and you see that milky, matt appearance that the rubbing down produces, but don't panic.....
Carefully 'feather' the edges of the new lacquer into the surrounding finish and then after rinsing off & drying the area, proceed to bring back the shine with polishing compounds. Personally, I've started off with liquid Brasso, then T-Cut before using a swirl remover and finishing with a decent, non-silicone based guitar polish.
I have no experience with using nail polish, but have heard that good results can be obtained. I have though, used those car touch-up pens to good effect. I even reproduced a replica of the artwork of Jimi Hendrix's psychedelic Flying V on my son's no-name V using those pens! I sent a photo and accompanying story of the project into Guitar & Bass magazine, was awarded Star Letter and a fantastic set of Seymour Duncan humbuckers to fit to the guitar!
However, if you don't feel confident in carrying out the above procedures, do heed previous advice and take it to a local repairer.
Good luck with whatever route you choose & let us know and perhaps see, the results.
Stephen.