Spray paint grill insert

Gonna order paint from automotive touchup. I want to color match my pro insert. From what I can tell I need adhesion promoter, paint, and clear coat. Do I really not need primer? Seems that way from their website since I'm painting plastic.
How many cans if blue paint will I need? Just doing the grill insert itself and maybe tinker with my platinum badges. I was thinking 2 cans ofcolor, one adhesion promoter , and 1 clear. I'll also get prepwipes, tack cloths and wet sand paper kit. What do you all think ?

 

Seen no one answered...i would personally do 2 can of paint. 1 can of each of the others. Have heard really good things about them. Wanting to get some for a couple things for mine too!