Thank you, I'll try any method to keep it polished. It's best to keep it covered after polishing. The polished aluminum Kirkhams hold their shine for a long time. The brushed aluminum versions are the easiest to maintain.
Here's another amazing video of repairing a damaged quarter panel on a Kirkham Cobra.
https://www.youtube.com/watch?v=9moYO-WWhaQ&t=32s