body colured rubber rear boot spoiler

[Octanejunkie]

Finally stripped and straightened the rear spoiler that is missing from my B2 80 Sport. The paint on there was horrific, with someone having tried to brush paint it in the past.
Now its stripped right back down to the rubber and ready to be re painted and re fitted.
Question is, what do i prime it with? Also it will need to be Tornado red. Noticed tha Halfrauds do a vynil paint in red, its a tenner a can. Would this be ok for an undercoat?
I'll probably paint the spoiler once its mounted to the car to minimize the chance of it cracking etc.
Anyone painted this kind of spoiler before? Help!