Hi Everyone, when I paint over chrome I tape the area off then clean the area with a degreaser then scuff the area with some fine steel wool, clean the area again then prime with Rustoleum rusty metal primer( the red stuff ) its like glue, it sticks to everything !!! let dry 24hrs then topcoat it with BBQ black or flat black.. For other applications you can even wet sand the rusty metal primer as long as you let it cure for 5 days in a warm area... I use this method if I have a part that has been rusty and after being blasted it shows small rust pits or sanding scratches, two or three coats of rusty metal primer then let it cure for 5 days, then wet sand 400 or 800 grit and paint with any color you need.. it works for me. Tony