The day finally came to start painting. Got out ahead of the heat and put the first coat of Zinsser oil based primer on today. All the sanding and filling really paid off as I only had a couple of small spots that I have to go back and touch up with filler before the next coat of primer. After that it will get three coats of Rustoleum Sunburst Yellow. (Yes, we finally made a decision.) I was mildly surprised that it only took less than a quart of primer on the first coat.
Before:
Two hours later: