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Many people advise the use of latex paint which should be readily available at any store that sells home improvement stuff or house paint (vs. art paint). I haven't tried it, so I can't really say.
There is some discussion about blackboard/chalkboard paint, but all I've been able to find is chalkboard spraypaint at Walmart. I don't really have an area appropriate for spraypainting, so I decided against that solution.
What I've been using is black gesso acrylic (probably any acrylic paint is similar). I find that I can make a little bit of paint go a fair way, but it does require a few coats of paint to look good -- 2 is typical unless I mess up and then I apply a 3rd to hide any mistakes I made. Acrylic paints are water soluble but can also be glopped on similar to oil paints...I'm not sure that's an advantage for a racing surface, but the variability does give you some flexibility on how you want the end result to go. It's pretty easy to mix acrylics to get the color you want and the paint is cheap.
My experience with the gesso is that it's still a bit smooth, but I'm painting over foamboard which is a pretty smooth surface to begin with.
Another option that you might want to look into is rubberized paint (haven't found any to try, so I can't comment on it), or mixing sand with paint to get a grittier feel. I'm not sure how that affects grip and I'm not sure I'm a big fan of that.
My primary complaint about the gesso is that when I left my cars on the surface for several hours, some of the paint attached itself to the tires so now I have some sticky tires. Ugh. I'd assume the latex paints wouldn't have this problem.
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