Cinnamon 75 Duster \

zkx14 said

Yep, and as said -I was not changing at that point... But to your question, it was ‘stable’. Maybe too stable. It just seems like there was no bonding or any interaction at all where it peeled. I think the spray can version is actually better than quarts due to different solvent base. Never had a problem with same topcoat over Rustoleum primer spray bombs in engine bay.

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Rustoleum really never hardens, that is why if you paint something and set it in the sun, it turns to a dull white chauk, in a few months. Its oil based, with no hardners.
I bet you can still push your fingernail in the primer where it peeled.
You did an excellent job on that car, on a budget, I am not giving you a hard time at all, your car looks great, and the best thing is since you built it, you can fix it.
Roll up your sleeves and get it done.