Those spots look like you ran over something and it sprayed into the wheelwell . I would take a stiff bristle brush and soap/water and scrub the area and see if it comes off . If it is paint then obviously it won't come off with that solution . Bottom line it doesn't look like rust to me . You can go to any auto parts store and purchase rust converter , a liquid you brush onto rust . You know it is working when it converts to black in color . You can then paint/undercoat over it .
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2002 Boxster S Arctic Silver with black top with glass window and black leather interior. Jake Raby 3.6 SS ( the beast ) with IMS Solution. 996 GT3 front bumper , GT3 rocker covers and GT3TEK rear diffuser and Joe Toth composites rear ducktail spoiler .
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