[World of Wheels]

So I've had a stock GM bodykit sitting around since Aug. I figure I'll paint it and put it on this week while it's still being stored. Do you guys recommend just scuffing and spraying it of should I primer it first. I know there's concern about the warranty thing, I was wondering if it is related to paint adheasion or just B.S. What did you guys do? If it was anything else abs I'd just scuff it and shoot it.