i refurbed my own wheels on my fiesta , 15 gti alloys ans they where abit fooked,. i rubbed all the alloys down with various grades of sandpaper, then i used a metal filler called METALLIC u can get it from halfrauds , sanded the wheels again so they where smooth then primed, painted matt black and lacquered them. job done. just let all the air out the tyres then mask around the inside of the wheel. easy