Thanks for your quick reply.

Just to clarify, I have a black jdm Nissan Silvia S15 Spec R. Is it true Jap paint is thinner? 1 coat black paint two coats clear?
As for craters I dont really know what they are called, but it looks like rain water droplets that have oxidised or something and left an imprint.

I think I'll borrow my mates buffer, and check out your buffing vids again.

Not really confident.