I don't know as I have seen this proposal specifically. Although it is a novel idea. I doubt a body shop would touch solar cells with a 10 foot (fiberglass) pole

This would probably be a home-grown project involving you, a soldering iron, a couple hundred solar cells, and a tube of silicone adhesive....and a nice farewell party for your pretty paint.
As for real world numbers...
http://www.eere.energy.gov/solar/solar_time_2000.html
Quote:
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Two new thin-film solar modules developed by BP Solarex break previous performance records. The company's 0.5-square-meter module has a 10.8% conversion efficiency—the highest in the world for similar thin-film modules. Its 0.9-square-meter module achieves 10.6% efficiency and a power output of 91.5 watts—the highest in the world for a thin-film module.
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So you are looking at about 100 watts per square meter (I'll bet they're not cheap though!!)...but if you covered the hood, roof and made a solar screen for the windshield and back hatch (glancing at the "insight encyclopedia") it looks like you may have about 3 square meters of useable space.
So, under full sun, you can rake in about .3 KW per hour...the insight battery is rated at slightly under 1KWh capacity...so this is starting to become a somewhat realistc scheme of fully charging the battery in 3-4 hours (around noon time on a sunny day)
Of course you always loose some power in converters, plus the cells under the glass aren't going to be as efficient as the ones in the open, but you could still have a good chance to "drive it like you stole it" to work and arrive with a dead battery, park in a sunny parking lot and have a fully charged battery by the time you went home.