I must admit I bottled out of doing them my self with a brush and can of Hammerite
I dont know why manufacturers cant have a finish on them that wont rust!
Your a bit restricted to what paint you can use on the bell as it gets hotter than the calipers which are taken of and stripped down, the flexible parts had to be painted plain black.
£300 seems alot but if I let it get worse it would be harder to clean up, I think I'll give the bill to BMW