Defining strip to bare metal before E coat

When stripping to metal before applying a good epoxy coat to seal then starting mud work just how stripped does it need to be since epoxy is such a great adhesive animal? What if there was a previous base of epoxy underneath? Is this bare enough or do all the little nooks and crannies need cleaned out? Maybe a Tony question?

I would hit it with an 80 grit scratch then expoxy it. Looking good :grinning: