I decided to apply a second top coat to the wings for a couple of reasons. First, there were a couple flaws that I wanted to fix and paint over. Second, I could still see some discontinuity through the top coat from the uneven primer beneath. Yesterday's coats were not tacky, but they were very soft so based on my conversation with the rep the new coat should chemically bond to the old. After I mixed a new batch of paint, I went around with a tack cloth and wiped down some places were dust had settled into the first coat and another place where I bumped into it with my rear end yesterday. I was able to make everything very smooth so today's coat went down beautifully.
I really like Polyfiber Mark II. It can go down reasonably heavy without runs, and it becomes very smooth as it dries. Places where I saw the paint go down a bit rough yesterday were like glass today. I used a relatively cheap paint gun (Husky brand HVLP from Home Depot.
After I finished, my wife made me burn my clothes.