I primed the rudder interior and the stiffeners. I used a rattle can of Zinc-Chromate primer. I wasn't too happy with how it turned out. It didn't coat nearly as well as the epoxy primer. I may back rivet the stiffeners in and then shoot a coat of epoxy primer over the completed interior prior to bending the trailing edge of the rudder.
I have to build a brake out of 2x4's Monday night and then bend it Tuesday.