Powder coating may be too shiny unless you can see a sample that is as flat as blackboard paint. A good finish but also thick, shiny and heavy.
I was just thinking they could blast it clean to prevent oxidation spreading and you can paint to protect the aluminium and prevent reflections.
Of course you could just clean off the corrosion and touch up by hand if you are covering with felt.
Is the outside ok? Hard to see in the images.
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