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Hey Fox;
I had an issue with my new sheet metal as well. I had given mine a light going over with the sand blaster, then a sander with a degreasing wash before applying the epoxy. I still had an issue with the shipping primer flaking later and ultimately had to sand blast them down to bare metal to start fresh.
Testing with the acetone may be a good check, I don’t know for sure. What alerted me to the de-bonding on my parts was the use of an air blower to remove the sanding dust. The air got under and edge where the sanding had broken through the epoxy to the shipping primer underneath and it flaked off.

Best of luck,
Steve