Hi, have always sprayed mine with rattle cans, normally 3 for a set of 4 wheels front and back then 2 cans of lacquer, I also have a cosmic and now have Blue wheels ......very wacky but easy to change when I get bored, cost about £40 to do all four wheels and a roll of duck tape to protect the tyres, I have it down to a full day for all four wheels and back on the car. Powder coating finish can be very hit and miss from what I've seen, best to go to someone who has been recommended or if you have seen their work before committing any money.