Search YouTube for "Testing The New BEHR Spray Paint - For Painting On Plastic", by Barbatos Rex.
He seemed to like it.
I used "Roasted Corn" ( yellow ) color on a 68 Chevelle, no primer used.
Saw a little very minor crazing in spots. Appears it would polish out ( I didn't ) or maybe spray over primer instead.
I would try it again if it was a color I wanted, and I would take more precautions.
JMHO.