What kind of trim are you talking about? The only "trim" piece that's really paintable is the cowl piece, other than that it's all a plastic/vinly covering. I use this stuff called Black Renew from Wizards that works very well on brining back faded trim, and it seems to last a long time, maybe you could give it a try.
http://wizardsproducts.com/Merchant2...Category_Code=