I am by no means an expert with this as this is my first year w airbrushing. Last year I had issues with spray paint adhesion on some plugs. I traced it back to using a gloss primer instead of a flat primer.
It all started last year during a terrible thunderstorm, when I locked myself out of the house. Shelving myself with a large piece of sheet metal, I ran for cover under the tallest tree I could find!