Here is the same spot after 24 hours of spraying. According to the manufacturer, it would go much faster if the ambient temperature was between 70 and 100 degrees. Since the stuff isn't flammable I think you could probably place an aquarium-type heater in the tank to warm the fluid up to 80 degrees or so and speed the chemical reaction up. Unfortunately I'd need to buy a lot more liquid to get it to a high enough level for the heater to work. So I guess I'll just let it spray as it is. It's kind of like those rock tumblers you had as a kid: you put the rocks and the polishing compound in the tumbler and let it spin for a month and then open it up and see the polished stones.
As you can see in the photo, more shiny metal is magically appearing with no paint/primer damage:
