Warpage

Your father must have been a metal finisher back in the day when there was thicker better metal in the car bodies.

Pick and file was the technique they tought us in autobody school in 1974. Pick up the low spots with a pick hammer or a reach in pry pick pry bar, then file the metal to shape again. Sand, primer surfacer it and paint

They showed us lead filling too, just so we would know how to do it.

We all hit the ground running and went straight to the bondo and never looked back.
Got to give it to those old world craftmen that could do the metal finishing, no easy task.

I use my metal finishing skills for resurfacing old school aluminum slot wheels, make them look brand new again after 50 years.

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not to highjack, but what do you put on them to make them stay that way?