I have used G2 Caliper Paint in red on my front Si’s calipers and love the gloss and durability of it. I have also noticed that every couple of years after break changes I sand down a little bit and re apply new coats (even though not needed I just like to re-update) the break caliper looks glossier and richer every time. This product is awesome! Here is the link and they sell it in tons of colors.
G2 Brake Caliper PaintSystem Set