I have run into this issue on a build many years ago. I used a one-part primer (West Marine store brand) over WEST epoxy and it never cured. I ended up sanding all the primer off and then applied Interlux 404/414 2-part epoxy primer (now called Epoxy Primekote). The Primekote cured just fine and sanded very nicely. I thought it was a reasonably high-build primer. The Primekote is also very tough. If I were painting a new build I'd certainly use the Primekote. One warning, the fumes from the Primekote are pretty noxious. Be sure to use a good organic respirator.