Rustoleum also makes a Metallic spray paint that dries much faster than their regular products. In fact they want you to apply the color coat over the primer within 10 minutes to achieve maximum bonding. It works very well and looks great. I redid my kite buggy with their Cobalt Blue with a clear coat layer and it is holding up well in spite of the greater abuse the buggy sees over what a bike does. Only drawbacks I've seen are it only comes in 4 colors - black, blue, silver, and gold, and you do still need to let it dry for at least a week.

Update 01/'08: They have many more colors than the original four now. I am still very pleased with how it's holding up on my kite buggy, which sees regular beach duty, including contact with salt water. Will be doing a bike as soon as the weather warms up.