The only issue I had when I had my old wheels Plasti dipped was when I would have a flat repair the rim area would get peeled off. Easy enough to reapply, I was usually due for a refresh anyway.Aerosol is the way I've done it for grille and emblems. I wouldnt recommend doing your rims as it probably won't hold up to that abuse, but I suppose if it doesnt you can always just peel it off and redo it or try something else!
Not sure I would do a grille or bumper though. Emblems for sure.