If your existing grille is chromed, plastic or metal, you may want to roughen the surface first with steel wool, medium grit sandpaper or scotchbrite pad. Clean with dawn dishwashing liquid first then clean any left over residue with isopropyl alcohol. Get a sandable black primer, prime, then lightly sand out any irregularities and wipe clean. Prime a 2nd light coat again. Then use the Krylon semi-flat black paint, with this color, the grille will have a slight lustre. Then use the Krylon Crystal clear SATIN to give additional protection to the painted finish. DO NOT mix brands of paint. i.e. Krylon is an enamel paint type. Other spray paints are lacquer or latex based. Good luck and cheers
