Thanks, I laughed at it myself, in hindsight. I should have stipulated "underneath" and likely appended an "if you follow...". Yes, well, they may either be ma

Thanks, I laughed at it myself, in hindsight. I should have stipulated "underneath" and likely appended an "if you follow...". Yes, well, they may either be materials that have other surface textures/coatings/treatments/finishes that aren't conducive to polishing, or they may be other metals, or non-metallic composites (can't put aluminum over a radar, for example), and so on. TL;DR: The painted surfaces are generally instances in which polished aluminum won't really work, for a variety of reasons.