Crankcase cover Polishing

[Whoops]

On my old CB900C, I tried to polish out some pitting which wasn’t as deep as your scratches appear to be. Essentially it turned out pretty poor. The cover while it was aluminum, also had a clear coat on top that seemed to be almost a coat of plastic like material. Once I started polishing it began to peel away, but not easily enough to strip it off. Getting into the nooks and crannies proved impossible. The polished bits looked very silver and the unpolished bits had more of a gray aluminum color and in between were bits of peeling clear coat. I ended up buying a new one when all was said and done. I am curious to see if your cover has that same coating.