I know it said sanding can happen in 20 minutes but I've never sanded primer within an hour. That right there raises an eyebrow but again, I've never sanded a primer within an hour so don't know for sure if it healed up your scratches or not, but do know those sand times are given with the thought that you are spraying in ideal conditions, which affect curing time.
Interested in hearing what Barry says, the guy is a mad genius with some of his posts.
