Its all about the prep work, do your prep workCommon practice to "cover your ass" against those nitpicking customers that don't understand the concept. Without a doubt you can spray one, just not sure how well it will hold up.
We sprayed this chrome Toyota grille because the customer had it painted and it peeled off. When the customer asked if we could Line-X it we said "Yes, but won't warranty if it peels."
Has not had a problem.