There are a few things you need in order to make a car with clay. The first is some clay, which you can get at most art supply stores. The second is a wheel or other tool to help you create the shapes that you want your car to have. The third is some paint or other material to put on the shapes you’ve created. Finally, you’ll need some air pressure and a heat gun in order to make the paint harden and create the desired look for your car.