I think it turned out great man. I have a Saint derailleur that I'll slapping on the 'PlayBike' build I have going on right now for only when I take it to the FlowTrail and I might just have to copy you if you don't mind, hahaa. I would be doing it in blue though.
Nice, do it! Yeah its all because of the chrome/glossy alloy underneath it. I'm sure the blue would look awesome as hell. Stays on like any sharpie should, except could always take it off with some iso alch which is nice.
No worries! It was just a bit of messing around that turned out really cool looking, im pretty suprised myself how well it turned out just make sure you clean the whole thing, get a new sharpie, and only do light runs, avoiding going over the same area twice cause it'll give it a weird streak. Then let it dry, avoid anything dusty as for few minutes it'll attract anything.