If you wanted to go all out, you can do a baked on ceramic coat in lieu of powdercoat, but they don't look shiny. We used Fireball Talon on my SM-10s and it's held up well to heat, they said it might last up to a year on calipers.
Putting freshly painted calipers in our oven is a very quick path divorce. It was bad enough just painting them in the garage.