epoxy primer??

I can't comment on that particular primer. But I did recently research the topic of epoxy primer and whether to put the filler over bare metal or over epoxy primer. The consensus seems to be that it's better to epoxy prime first and if possible, apply the filler during the primer's re-coat window. Some car manufactures even require this to protect the warranty. Many production body shops don't do this because of the added time and cost and the filler manufacturers say it's not necessary. This very short article matches most of what I read on various message boards.

http://www.crankshaftcoalition.com/wiki/Epoxy_primer

My car will be going to media blast soon and I was thinking that I needed to hurry up and get the filler on it before the thing gets primed, otherwise I would need to grind off the epoxy every place I needed filler. Wrong! It's actually better to epoxy prime the whole thing first and then get the filler on it as quickly as possible after that. I will do my best to finish the metal work including hammer and dolly so that I can just fill without molesting the primer.

Back to the original thread. It does say this about 1-part epoxy primers:

"Real epoxy primer is a two-part mix, with a hardener that has to be added before spraying. The common epoxy paint you buy at the local hardware store in an aerosol can is not considered a true epoxy primer."