Canalman,
This fellow has a YouTube channel and he uses the Walmart acrylic paint to airbrush.
http://www.youtube.com/watch?v=UAGWSK19C5M
He also uses paint pens to make some really authentic looking graffiti. Somewhere in his videos he talks about thinning and spraying the acrylic but I couldn't find it quickly. I suggest going to his channel and doing a few searches. It seems worthwhile to check out his work at any rate.
Phil
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