I would clean it first with first to see if you want to keep it natural or not. You could use Bar Keepers friend, it can be used on Aluminum. Good Luck!
I was wondering if you could help me with something -- I have an entirely oak kitchen. I know it's the rage now to paint or gel stain cabinets. I've been considering ...
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http://homeguides.sfgate.com/paint-vintage-aluminum-tray-95789.html
Speay paint for aluminum
Do you still want to use it for food preparation?
I would clean it first with first to see if you want to keep it natural or not. You could use Bar Keepers friend, it can be used on Aluminum. Good Luck!
Oh, I see. How nice that you are wanting to keep it as a heirloom.
I was a little concerned about some paint not being suitable for use directly touching food.