To be on the safe side always buy a second can just in case your not satisfied or you run out..not all 1/8 scale body's are the same size and that goes for any scale due to different manufacturers..
@King blitz ... This


is how I've ended up with so much spare paint

I think my next body will be about 15 different colors..!!
That's my problem- I am impatient.

I got sick of waiting for the warm weather so decided to do it when it was sunny but slightly cold and using the girlfriend's hairdryer to speed up the drying process. I agree on the stickers though. I have seen far too many awesome paint jobs hidden by awful stickers. I do like stickers on my rigs but I don't go overboard.
@Dangerous_Beard ... The UK sucks for painting bodies, the weather is always crap

this is the reason why my projects take so long to complete..!!
Only tips I can give you are the same as other have said, put tins in warm water before use, warm the body somehow (hairdryer, put in sun etc) Tamiya paints work best at a certain temp, but the humidity is more important than the actual temp in my opinion..
I've had decent results using the #1 Tamiya 60/60 rule..!!!
Borrowed this from another forum...
[1] Tamiya recommends
60-60 rule. Less than 60% humidity, over 60 degree temperature (16 degrees C). I try to aim for 10% more (less than 50% humidity, warmer than 70 degree temperature: 21C). I don't spray indoors, that's bad for everybody's health. So I only get about 100 days of spraying weather out of a year.
[2] Spray
horizontally so the heavier particles would not hit the body, keep the can
warm.
[3] Fling the can often to remove the droplet forming at the nozzle. (you can dab it away--be careful not to add lint) That
one big droplet at the chin of the nozzle keeps making bigger droplets.
[4] Spray upside down between coats. (not to the shell) Doing that for 1/2 second clears nozzle, and allows cleaner spray for the next coat. Originally, it's a method to keep the nozzle from clogging for long storage. But if you don't clear the nozzle between coats, even if you spray in 15 minutes, half-dried sticky droplets start to fly on the next spray. ( Don't spray upside down for too long, or else you won't have propellant left for the paint. I spray 3-4 times with one can, and there is just enough propellent to clear the nozzle between sprays)