Needing some help on adhesion. I am using new in package plastic baits, sanding them to scuff the surface and applying Krylon primer. I am allowing the primer to dry for an hour then airbrushing base coat white by Auto Air waterbased paints. I am putting a very thin see thru coat over the primer, then use a hair dryer to dry. Repeating the process 5-6 times until a nice coat appears. Although I let it set overnight I can use my fingernail to scrape thru to the primer. I don't have a clue why the auto air is not drying eventhough I use a 4011 reducer and apply in extremely thin coats. Help!