How to Polish Aluminum Like a Mirror Step 1: Prep. You will need to remove any coating if any on whatever you are finishing. For my wheels, they did have a... Step 2:. Depending on the aluminum’s finish will depend on what sandpaper is needed to start out with. Any porous... Step 3:. Once satisfied, ... 1. You will need to remove any coating if any on whatever you are finishing. For my wheels, they did have a clear coat applies which needed to be s...