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when you sand and buff into metallic you expose the metal. your pad will turn black. they may have polished it some but if you try to cut and buff it will change the color and streak.
as for...

i'll help anyone until i see the words shopline or omni then i'm out. same with eastwood or sumitt .

you cant buff ss metallic. it screws up the color.

single stage concept by ppg.

you can shoot a ss but you'll need to clear it . i prefer ss myself.
quality of product is more important. dont buy into the hype about cheap relable junk out there .