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The Kirkham cars are welded using the parent material as rod. This means that other than impurities in the weld, you get the same metal used for both the panels and the filler.
I wonder if AC used some other type of rod when they were welding them? Could you see the difference as you sanded through the various grits? If so you may not be able to get rid of it as it is a different material. Just something to look for.
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