As far as I can remember, a color match isn't done by matching the paint to the body and spraying the bumper. It's done by spraying the bumper white and fading into the body. Which means spraying the rest of your car, at least the front.
Which means, the new paint won't like your old paint and will probably turn to shit in 5 years.
Plastic bumpers don't need to be primed if I remember correctly. You can prime them. The additive is just something that mixes in the paint. Paint itself is really flexible, so if it's cracking it's prob your bumper, not the paint.
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