on the paint front, I was in my local euro bods and they had the E-Tech kits on the shelf and selling for silly cheap money, I wasn't looking to paint mine at that precise moment as i had a big brake kit on the way but the price was too good to turn away just to use for the rears, decided against fitting the brembo's and stuck with the S4 based ones on the car just used the caliper paint.
just make sure you give the calipers darn good clean first, I got my get washer on them first , then used a wire brush to get them nice and clean , then used the brake cleaner in the kit, removed the pad retaining clip aswell, then used 3 coats and helped things alone with a hair dryer, job done and the paint is rock hard now with no sign of it peeling or flaking off anyway even after using a get washer on the to keep them clean.
just make sure you give the calipers darn good clean first, I got my get washer on them first , then used a wire brush to get them nice and clean , then used the brake cleaner in the kit, removed the pad retaining clip aswell, then used 3 coats and helped things alone with a hair dryer, job done and the paint is rock hard now with no sign of it peeling or flaking off anyway even after using a get washer on the to keep them clean.