Information from Tamiya's website:

These cans of spray paint are extremely useful for painting large surfaces. The paint is a synthetic lacquer that cures in a short period of time. Each contains 100ml of paint, which is enough to fully cover 2 or 3, 1/24 scale sized car bodies. Tamiya spray paints are not affected by acrylic or enamel paints. Therefore, following an overall base coat, details can be added or picked out using enamel and/or acrylic paints. By combining the use of these three types of paints, the finishing of plastic models becomes simpler and more effective. 

Always use these paints in a well ventilated area, and preferably with breathing gear.