I have spent about £60 on paint from Halfords and I'm still worried I won't have enough to get a durable finish on my case.
I have 3x 300ml colour for the inside, 2x 500ml primer, 2x 300ml colour for the panels and 2x 500ml clear laquer for the whole lot.
Hopefully this should be enough to get it sorted otherwise I'll be upset about the money wasted really. It is my furst venture though, so we'll see how it goes. Currently the case has been fully stripped down and re-riveted and I have most of the inside parts in primer on one side.