I used this trick to mask a bright silver scratch in an excellent budget IRO rim. I learned it from Problem Solvers’ photostream (they have a special pen for it: a sharpie with their logo on it).
Here’s a dramatically scuffed up LED “tactical” flashlight I found in the road on a bike ride. About a minute with the sharpie, and it looked a lot better. From a distance. It still looks gangrenous, but it was instantly appropriated by my 11 year old son as an Airsoft accessory, so I’d call it a success.
“Yes, son, trust in duct tape, Sharpies and things you find on the road. You’ll go far.”