So I called Clausen to see if you can buy their Sandy polyester primer in less than 4 gallon increments. It turns out that if you call the order in, you only need to be over $100. So I ordered 2 gallons of the Sandy ($107/gallon) to use as my last coats to block sand. In talking with the guy, I described what I was doing by sandblasting and using Epoxy over the bare steel. The guy insisted that epoxy is not waterproof, only water resistant. Now he may have been trying to push the other polyester primers they have as he said those can be applied to bare steel and are waterproof and that no other product needed to be used until final paint. From my understanding, the Sandy is also waterproof, has no recoat windows but cannot be applied to bare steel, unlike their other 2 polyester primers. Since I have epoxy on the bare steel, I went with the Sandy. I want to here feedback on what this guy was saying.
Al