It's pretty cool stuff, I only heard about it a couple of years ago myself!
Badges and rims will be straight forward but I would not advise doing the car yourself as it's something you want done properly with the correct equipment, otherwise it'll look cr@p and be a complete waste of money and time. Someone had there A3 done and I'm pretty sure it was around £800 to have a professional workshop do it for them. You can buy Plastidip in big tubs rather than the cans which is what's used for large applications such as cars.