Pactra acryllic water-based Lexan paint wasn't very good IMO. Chipped very easily for a Lexan paint, so I never went back to it.
I have shot the Createx/Faskolor/AutoAir paints for years, and the trick to spraying fluorescents or any water based paint is just like everyone else said—lots of light, thin,
dry coats. The more the better. I force-dry between coats with a heat gun and it works very well to speed up the paint process. I like to shoot more coats with fluorescents, though, thinning 2:1 paint to reducer (clear glass cleaner), and let it go on really easy. Patience is a virtue with water-based paints, especially the fluorescents.
Be sure to back with a good coat of white when you are done, too. No one tells you that, but its a key to the day-glo paint "popping."
All of these were done with the same water-based fluorescent paint you are using... (orange, red, pink, purple)