I did see a set of forks on here a while ago that the owner has applied some sort of carbon tape too that looked really good. No idea what the tape was or where to get it from, but it could save you painting over the original finish. Thinking about it, maybe it was some car detailing stuff? Halfords would know more I'm sure. I might do it myself now I've thought about it, but my worry would be creating an invisible join in the tape?