I'm not sure you're listening. If the coating is DLC, and you cut aluminum cans, those aren't scratches, it's aluminum smear, and can be removed.
If it's really scratches from say, cutting hardened shim stock or something like that...then disregard.
BTW, it ok to cut aluminum cans with your knife.
If it's really scratches from say, cutting hardened shim stock or something like that...then disregard.
BTW, it ok to cut aluminum cans with your knife.