the silver is recomended for rust that is more advanced....the silver will be closer than the black Por-15 but when you are all done treating your car just buy a can or 2 of Krylon smoke gray gloss from walmart at $3.00 a can and spray over the part you treat....that is a very close match and is what many owners use. I bought the 3 part starter kit from Por-15 becasue i just had a small rust spot and then finished it up with the krylon. worked great! Mike C 2109 [Non-text portions of this message have been removed]