Personaly im always against such cheap chromes, But they look delicius on dark colors on the face lift corolla, maybe because of the chrome touch in the rear lights.
PS: The grills are obviusly plastic, If they are actualy chrome then its oky other wise to protect them tell ur painter to spray lacqer on them. So that they remain in the same color always.
Have you considered Royal sheild? Jst recomending you because we have a 2008 Dark blue, And its lost all the shine, Pakistani car colors arnt too gud, Or maybe the sun is too much here.