I've been considering brightside or blue water myself taking into consideration the UV protection and "snow birding" in salty air and beach conditions.

I've been using Rust-oleum Professional. I can't recall what exactly Exit was using off the top of my head, or if it was posted.

As a primer, rust-oleum professional seems to sand down smoother, seal (bondo), and hold up better than primers I've used in the past such as Dui-color and another automotive primer whos name escapes me at the moment.