Well, it's been a while since the last post, but I was looking for some fun and thought I'd give it a try.
By the way, Lanze. The second method that you guys talked about for this where you simply paint the color onto the car can be improved. The way I did it was just as easy. Before painting, I clicked Layer/New/Layer. Then I set the mode to "Color." Now you can simply paint the car like you would before. The reason this is better than the first way is that now you can change the color of the car in seconds! Just select the new layer and click Image/Adjustments/Replace Color. Use the eyedropper to select the color of the car and pick a new color. That's all!
This is how I've been doing it for a little over a year. It's very logical, so it's easy to remember. Lol. Anyways, If you want to, give that a try. You'll like it.