What kind of inexpensive paint is good to use on an art car?

I’ve seen a lot of cool art cars, but I’ve also noticed that on the ones that use acrylic paints or house paint, it tends to not look so awesome after a while. I intend to paint a car in the near future, and would like to know what kind of paint will resist fading and stay bright and shiny on the road. It should be something I can use with a brush. Also, does anyone know what Janis Joplin had her car painted with because that was done a long time ago and it still looks awesome.