To protect the metal from rust on a steel car. On an aluminum, or carbon fiber car it is not necessary to paint the car. As an example all DeLorean's were not painted from the factory as the body panels were made of aluminum.
It varies a lot go to a body shop and get an estimate
Yes, you can paint it yourself or you can take it to a body shop to have it color matched and painted. If you choose to do so, you can get automotive paint to do it yourself.
When first made they were hand painted however in the modsern age they are spray painted onto the metal body of the toy car.
It is spelled STEEL. Steel is a strong metal that is cheap.
ReveMoto.com sells painted auto body parts. Really affordable.
You can get a car bumper painted at a local auto body shop such as Maaco. You can also get bumper work done at your local Auto Zone location. You can learn more about Auto Zone at the official Auto Zone website.
No
Pretty much any auto body shop will paint your car. Since they give free estimates, you can take it to different ones to find which one will you the best price.
For cheap car insurance to qualify as "cheap" in the UK depends on what the definition of cheap means to the person buying or paying for the car insurance. The price may also vary because of the make and model of the car or if it's from another country.
No
When its dry