Unless you’re prepared to use Alclad II (which IS amazing), there’s not much out there that can simulate a shiny chrome surface. I personally don’t like to use anything that has strong organic solvents (enamels and similar products), and the only other option for acrylic users is Vallejo’s new Metal Chrome. Simliarly to Alclad it’s not easy to achieve good results, especially if you only need to paint small parts.
Well, enter the Molotov- Liquid chrome pens. They are literally markers which dispense a very reflective, very realistic chrome colored paint. There’s also a very good video on their website which is worth watching.
Unfortunately the pen is not suitable for large surfaces (the paint does not even out completely, so there will be marks left over), but there is a refill available. It might be possible to use the paint in an airbrush; the paint is alcohol based, so isopropanol should be perfectly fine to dilute it for spraying.
In this form- as a pen- it’s perfectly fine for smaller details like headlights and other surfaces.