Petrol tank.

My candy apple roadster tank is original and the underside is the same colour, though obviously not in any way polished. My interstate tank is the same, but it's black, so that won't provide any evidence one way or the other.
 
My original blue Interstate fibreglass tank was black on the bottom but they were made in two halves, upper and lower. I bought a replacement steel one which was the same colour all over.
 
Based on the stuff I've seen, all plain and metallic/candy steel tanks were painted top and bottom in the same colour, whereas the painted fibreglass ones were finished in the flake colour on top and plain gelcoat colour underneath.
I haven't seen an original fireflake steel tank underneath yet, so I'd be curious to see what they looked like when they left the factory.
 
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