I do use the dupont and ppg wash(acid) primers over freshly sand blasted metal, have been for a long time. It provides extra grip I believe if I'm going to all the trouble of sand blasting.

615s variprime is the dupont paint and PPG make 2 kinds and only one is OK for blasted metal, it works good as I have been painting trucks since the 90s and keep my trucks for years.

IMO there's nothing better than freshly blasted metal to paint, I have never used any thing under my acid wash primer and then epoxy on top of that. I never even touch the metal after blasting before wash primer. I usually blast it and paint it the same day.