It's not metallic paint. It's called "chrome plating." It's not really chrome either (Silver Nitrate), and doesn't have the harmful effects. It's a chemical treatment which is similar to how they make mirrors nowadays. Jay Leno had a segment as well. It's pretty neat. They can chrome plate plastics. It involves a clean base coat followed by the treatment, which appears to be water-based.
What I would like to see is this treatment followed by a bit of tinting for a black chrome effect to tone down the "bling" factor.
Here's one of the videos: