painting question...

Hi all,

I've decided it's time to get a bellypan on the monster, just have couple of questions to do with painting it! I did the last bike with hammerite and it worked pretty well, thinking I should be a bit more professional with this one though

Wondered if anyone has found a (black) spray that's a reasonably good match with the rest of the plastics (I'm considering doing something with the tail too eventually so want to find something that looks right ), also is using a primer necessary on these white gel-coated parts?

Thanks, Adam