i went from this: just your average rough cast vw bug alternator
to this: polished
not my pics, but it looks exactly the same
i used 80 grit to knock it down to a relatively smooth uniform look
then i stepped up to 100, 200, 500, 800, 1000, 1500, 2000, wet sanded, then polished the fuck out it with 2 polishing compounds, course and finishing
it just takes patience. can you do it? of course. will you want to after a few hours? probably not LOL
after doing 1 alternator, i will never polish another part. ill powdercoat before i polish
Lloyd