I admire you for trying to do this on the cheap but you'll struggle with a car tyre. If you're using water colours ( literally ) to paint with you need next to no pressure so the car tyre is acceptable. However these paints should be sprayed at 15 - 20 psi for solvent based stuff or between 30 - 60 psi for waterbased paints like Faskolor, Createx or Autoair.
A car tyre will instantly start to decrease in pressure even if you fit a regulator, the idea of a regulator being to control a higher pressure down to a lower one, however if you need a high pressure to spray as I've mentioned above the pressure will soon decrease so you need to start altering the regulator. The car tyre will also get down to a useless pressure and you'll be there with the foot pump trying to re-inflate it so you can finish the coat you were working on.
If you manage this you'll soon get tired of it, I would strongly recommend trying to at least find yourself a cheap compressor, they sell on ebay all the time and you can probably find a cheap airbrush too.
However, all this is well and good but I have found aside photography these really are products where you get what you pay for.
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