When I looked into the liner process it came up as a phenolic / epoxy coating that is applied to the metal before it's rolled and seamed. I'm guessing that combination of materials is why burning doesn't help remove it. I tried pretty hard with a weed burner and all I got was the outside white paint to change color, while the red just stayed red and no easier to grind off. I really only was inside the barrel an hour and a half, so it's not an endless job if you work at it.
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