Haha; I edited my post, obviously I meant calipers, not rotors . I painted mine while they were still on the car. It was pretty simple, really. I jacked the car up, removed the wheels and painted the calipers using a foam brush and spray paint (spray the paint in a small cup / bowl then dip the brush in it and apply the paint). I applied two coats and within 20 minutes I was on the road . Of course the drying time depends on the paint, temp etc.