Scuffing Epoxy Primer

I have been in the bodyshop industry for the last 10 years or so. I have sprayed only PPG products. What i would recomment doing ,if your epoxy primer has been sitting over 48 hours, is scuffing it and coating it with another coat of epoxy, then hit it with your primer surfacer within 48 hours. This way you will be guaranteed to not have any bare metal spots under your primer surfacer and you will not need to use any etch primer.