In all honesty I'd just spend a few quid and get brand new ones, I did this and it made all the difference..
Most of the time the lower grill is still as it was, so its a case of new top grille and fog light surrounds, think I paid around £55 from renault - you'll spend £15-20 in paints and sand paper.
Might just be me bit you can tell straight away if they've been painted, me no like!