[Teds89IROC]

that last coat of primer should be wetsanded with 400 before paint. you also should scuff the whole car, any shiny areas, or....areas w/out new primer. Go to a body supply place and look for "scuff stuff" use that with a grey scuff pad and water. You can actually just do the whole car with it after you've wetsanded the primer, just as a safety precaution. After this you should be all set.

~Ted