I purchased an A Pillar dual gauge pod. My existing A Pillars are gray and the one i bought from Autometer is Black. I want to paint it to match the gray. Is there any prep steps I need to take before spraying it with a matching gray? I was wondering if i needed to sand it down and what not. I'm going for more of a mat finish and not shine or gloss as i want it to match the rest of the car. Any suggestions? thanks.