Not sure if the standard silver paint mentioned in these write-ups will match OEM Subaru, but at least the process is well-defined and straightforward:
The NASA guide to home wheel-scuff repair... - AudiWorld Forums
Spent the afternoon repairing a wheel with NASA Racers technique!! Band width intense! - - -> - AudiWorld Forums
The NASA guide to home wheel-scuff repair... - AudiWorld Forums
Spent the afternoon repairing a wheel with NASA Racers technique!! Band width intense! - - -> - AudiWorld Forums
