Caliper paint

[JcGc]

I recently purchased new front disk brakes for my 69 camaro. The calipers are just stock, one piston. The calipers are a gray cast color. Do I need to paint them to keep them from rusting? And if so, what type of paint do I use, and do they make a caliper paint that is cast gray in color.

Thanks in advance,
JcGc