I would not trust epoxy in a common aerosol can. If it's pre-mixed, it's not really a 2 part (real epoxy primer requires mixing with a catalyzer that starts an exothermic process that only lasts for a few hours), If it has separate chambers, I would not trust that it is properly mixed as it leaves the can. Also, there would be very limited induction time, which is important for expoxy based primers.
Remember, according to the marketing folks, all paint is two part. One part pigment and one part acrylic. I just don't trust that you are getting what you think you are. I remember the lawsuit with Kraft where they said it was 100% grated Parmesan cheese. The cheese was only 10% parmesean, but it was 100% grated. They actually won in court.
Larry