I went with the Eastwood RE on the rear axle housing. It actually behaves interestingly. I was surprised at how thin it was going on, and surprised again at how quickly it set up. I made sure all the parts I hit were at room temp, and performed the process in my basement. I let it set up for a few hours then moved the whole show to the garage to reduce fumes.
I used a cheap brush to apply it and the end result looks decent. I wouldn't call it show quality, but it is exactly what I was looking for, and should work on the floor pans I want to hit as well. I would consider actually applying it in a slightly cooler environment like my garage - that might give it a little more time to level out an reduce streaks from brushing. But that's something I wasn't really concerned with for this application.
Once I figure out the pumpkin and get it installed, it's going to get some of this as well. I was considering top coating with some rattle can black, but that would really be overkill for what I'm trying to do.