If you ever remove the strut or other suspension component, you should get an alignment. You should also get one every 6 months or a year, depending on how much you drive and the road conditions you drive on.
Make sure you clean the caliper with a degreaser or brake cleaner, then you should high temp prime it then high temp piant it. It's easier if you remove the caliper, but not totally necessary.
Im not going to use yellow, would NOT match my car. gonna use a tan with a possible sprinkle of slight gold to match my car color, which is sort of like a champagne. Im not gonna paint the calipers I have on now because they are old, just going to buy new rotors and calipers, because I need them anyways. I just got new tires also and they did the alignment. I also had a stud that was stripped because some ass at the dealership overtightened the lug nut with his air gun. So all that came out to 480 with tax. got goodyear eagle tires, so far they are very nice.