Amd Primer

Think of it this way. If someone brought you a car to paint, would you strip it to metal or scuff and paint over what they brought you knowing you'd be on the hook for the whole job? Treat it like that. You don't know the conditions under which the edp was applied any more than you would know what was under someone else's paint, or epoxy job or even filler. it's not worth the risk in my opinion to leave it on. Just strip it and git-r-done.