and he is right, you dont necessarily have to use hi temp paint because either way with disc brakes (especially on non-RS models) your biggest problem you will discover is brake dust itself. it gets so hot that it bonds pretty tightly to the paint on teh calipers and if you try to hard getting it off you may chip the paint. but with a metal surface (like a caliper) it couldnt hurt to primer it first like GSwede said (5 times)
