Most use aluminum oxide to blast SS if you plan on refinishing because it will give you a slight rough texture for something like Cerakote/KG Gunkote aka Norrell's to adhere to in the process. Glass beads are not recommended for the same application as it does not scuff the metal surface.

I also wouldn't recommend sand as sand you buy from big box stores have dirt and other contaminates in the sand and sand tends to be wet, which wouldn't be good for any metal surface.

When I blast, I'm refinishing my firearms, so aluminum oxide for me.