depends on what you're looking to do, if you check my garage, you'll notice my car gained some black lol it was all plastidip. it's a great product, just remember to do even coats, and if you spray extra coats it'll be more durable, but easier to remove when you want to. what do you mean by grille? the whole thing or what? if you want to PM me, I can shoot you my number if you need any help.