Dulux have been making this for few years.
If it had been the cold, the primer will have small crystal in it, i would say it either was a contaminant or it was not stir for long enough as it oil based, and you can only use oil base products as a top coat.
As others have said, use a chassis paint designed for this job or power coating, hammerite is ok, but doles quite quickly.
Terry
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