Is there a buffing wheel for dremel?
I also have the 8" buffing wheel but for some things it is awkward.
There is also the occaisional missile launch which can be dangerous for the part and for me.

I polish many parts inside and outside the cabinet.

Many times, i am worried about polishing the steel and removing plating.

For example, i believe many of the steel parts are zinc plated. You can remove that plating and polish like a mirror but then it is raw steel. My fear is it will likely rust in just about any enviroment.
In cases where i believe the plating is gone, i will give it a quick clear coat. Other parts i trade mirror shine for a brighter than tarnished look.
In these cases i soak them in evaporust for 1/2 to 1 hour to brighten them up without removing the plating. It also works for more complex shapes that would be a pain on the buffer or to hand polish.

I have used several of the chrome spray paints.
I have had mixed results.
One of them looked just like chrome. Problem was you could never touch it. If you touched it, the oil from your skin was not removable. This was true even months after spraying it.
Others just looked like silver paint.

I generally use polishing instead of spray painting. But there are times where i will spray if the piece is never going to look good no matter how much polishing i do.