Iv ordered a new wing for our kangoo and its come in the black (paint?) they normally come in. What is the process for spraying them the colour of the van? Do i just rub the panel down and paint over the top or do i have to use primer?

Yes, I think you will need a primer.

David

Rub it down and prime it, the black stuff is only storage paint ( cataphoretic primer) to keep it looking decent on the shelf. Check it for dings and scratches, they do get knocked about a bit.