u/Here_fortaco

Im looking for advice on how to remove scratches and polish these small aluminum angles and flat bars. I want a mirror finish. I have sandpaper from 220 grit to 3000 grit and Mothers aluminum polish. I did a test on an extra panel of alloy and it didn’t work out well for me. I have seen videos of people polishing truck parts and only dry sanding to 600 and then using different buffing wheels and compounds but i don’t know what exactly it is i need. All tips, tricks and product recommendations are welcome!