Hi,
Is the master cylinder(either a factory one or after market dual bowl one) supposed to be painted or in original metal type finish. Another words - if you get a new master cylinder over time it develops a rust type condition on the outside since it is raw metal. Do most people paint them or leave them as is. I guess once its installed its too late so this would be prior to installation.

I was just wondering - its never a part I paid much attention to the exterior - just the maintenance of the interior.
Thanks