i have done mouldings on cars that were older then this and the stainless came out ok ,be careful on old cars you could have on the same cars windshield mouldings in stainless and side mouldings or hood mouldings made out of anodized aluminium .
looking at the picture it does not look like pits but more like sanding marks or even grooves left by a wire wheel or something similar .
i would try JROW s suggestion and see what happens if you don t sand before buffing , first with sewn wheel , if no grooves show then try again no sanding but with sisal wheel then you will probably see if problem came from sanding or the sisal wheel .
but to be honest with you . if they re stainless i don t think tht the sanding or the sisal wheel did these marks there might be a part of the puzzle we don t have
