Hi jtcb,
What jacking tools are you going to use to securely lift the B?
Remove the wheel to paint the caliper.
Buy the proper caliper paint to avoid warranty problems.
(heat is generated)
Painting by spray or brush is fine.
No paint on the wrong places.(rubber and fittings and electrical connections)
Masking could take a lot of time.
To do it right takes patience and time.
Caliper must be
perfectly clean and your work will show better if it's painted fire engine red.(some high end brakes are red)
Remember, all of your work will get very dirty in no time because brake dust is somewhat corrosive.
Good Luck!!