Try and get a BMW paint .. I went to 'motorcycles', then 'street' and BMW doesn't come up as an option.
Plus, it'll probably be a base coat clear coat with a primer, no?
I'd like a sliver in a Home Despot type of paint with primer built in.
I tried S100 and no luck. From reading on UKGS's Forum the stains won't come out with anything you can do besides top coat it.