i fitted it earlier and was fine

erm i went to halfords, i did mine white, so i got white primer, im sure white wud be good..1 tip, do as many layers as it takes, i did 7 to get the finish i wanted, i did like 4 of primer and like 7 of paint
if u start doing layers to think then paint runs together and drops and then u have to sand that arear down and it sands down to black agen, then u have that area black and the rest coloured, so u do it think there to catch up and the same happens and you get into a cycle! be patient and do tonnes of thin layers
u can wait just like 1-2hrs in between each coat as long as u dont sand.