You wrote:
>I have a 84' coupe with a badly faded spoiler.   Does anyone know of
>a product that can bring the finish back to life?   
Paint!(for the finish) ( 'Back to Black' works well!)
> If a product like this doesn't exist can anyone point me to a parts
resource for
>a replacement?
Salvage yard! 
 Go ahead!  Try the dealer!
                                    Mik