From my experiences as a scrapper - The tin is a pain to get off. They wrap it, then fill it with foam. The foam adheres to both the tank and the skin, making it very difficult to remove.
The tin is not powdercoated on the inside, it's bare steel with lacquer on it. The tins are often 1mm or so thick, and not easy to form and manipulate without hand tools.
I've used it for patch panels on cars, as well as to make tins for random projects including motorcycles and ATV's.
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