Pvc door paint?

Hi guys

Got a job to do for one of my best costumers she wants her front door painted its a pvc white door she wants it pillar box red gloss or satin. Can anyone help me with best products to use? I was thinking a johnstons advanced primer then a standard exterior gloss on top? but am unsure what to get as i have never painted on pvc. Any advice would be much appreciated. Thank you.