Well I have had great results with epoxy over bare metal and then all the body and fill work on top of that. I use PPG DP series epoxy and the results have been stellar.
But, it's designed to be applied over certain finishes including bare metal. I dont know anything about Eastwood's Oxysolve. So I think you are going to have to get a hold of a knowledgable rep and talk about it. Forget the jobbers.
It has been said over and over on the forums and I have really come to believe it.
Step 1. Pick your supplier and your final paint choice first.
Work backwards from paint to sealer to fill primer, etc until you get to the material you spray on bare metal. Stay with the same manufacturer.
Wish I could be more help but its hard to talk compatibily when you are using different manufacturers.