try the g2 products. its a 2 part epoxy that will do all 4 calipers. around 37$ shipped
heres the link for the caliper removal. its very detailed. the website also shows the rear removal SLK32 Brakes

i used the red on mine but g2 has a wide color selection
http://www.caliperpaints.com/
i did the same as brianbrave new pads lines fluid so it was easy to do it while removed. CAUTION! the clipers are side specific. if you mix the carriers you can reverse them but never get them to bleed. bleeder on top ensures proper side fitment. i know this cause i did it!! once you mix the paint you have a limited time to use it . once it hardens its scrap