Air bottles are a nightmare, they only have short air hoses too so you'll end up knocking it over at some point and then you'll get some sort of frozen effect in the hose and when it thaws it'll come out the brush messing up your paint.
Then you'll think, oh well I'll hold the can, until it freezes to your hand, when you get it unstuck from your skin you'll find the pressure has dropped so you'll have to stand it in a bucket of warm / hot water, you'll be pleased with yourself to have got this far, the water will cool, the pressure will drop further and you won't have finished the 2nd colour.
All this is from actual experience when I was about 12 (25 years ago) painting model tanks that were 35th scale. I can't imagine what it would be like needing higher pressure to do a bigger area...
Essentially I'd avoid using them at all costs. Save your money and buy a compressor or as Mark has suggested if it's only a simple design get Aerosol cans. Car tyres are okay but again pressure dropping will cause problems. Or, pay someone to do it, if you're only doing 1 or 2 a year it isn't worth paying out for the gear and for what you would someone would have painted it for less...
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