Sorry I just saw that you messaged me, but the answer here will benefit more people.
Yeah those pewter ones and steel will be fine with super blue. Super blue won't do anything to aluminum at all.
Aluminum black will work though. Don't do the baggy trick with aluminum black. It's too harsh. Just get a cotton ball soaked in AL black, and apply by hand (USE GLOVES). wipe all over it. then wipe off with a clean rag/paper towel. Then keep doing that over and over again. Buffing back down. After a LOT of time you can get it to look just like steel .