So bit of a rubbish update, I gave up painting my fascias as I'm not very good at spraying from a can
The gloss black I used was a rather thick paint, it ran and made a horrible mess of my plastics. I didn't have a proper primer so used some Citadel acrylic based brown that I had laying around. So, I've rubbed them back and they're now with my sprayer... Not sure what it will cost but he will still need to rub them down and he's going to put a high gloss black on them for me.
Will be worth the money in the end!
Proper Rally style now! Haha