I thought I could be of some use to someone wanting to paint their armor in camo, and quickly. All you need is the colours you want for your camo, eg, gray and black (the colours I use), and a pack of blue tac (or what ever colour tac is politically correct).
First, spray the tank compleatly in one colour, we shall say black seen as its a good base colour.
Wait for it to dry, then apply the blue tac into the camo patern you require. Then spray your second colour. You will need to act fast here, after spraying remove the blue tac other wise the spray will melt it to the tank and it is a pain in the arse to remove. You might want to wear gloves, or you could just man up and get paint on your fingers.
Allow to dry and paint in the detail. Result.
Again, I will post a pic of my only compleated tank soon!