Hi. Can I use a normal air brush? does the original paint have to be taken off? wat primer do I use? what kind of paint?

If you don't know the answers to those questions, I honestly do not recommend trying to paint your own car. It takes a lot of skill and experience, and what type of gun you use too. The good ones are 500 bucks each. And yes, you have to sand down your entire car with 400 grit wet sand at least 2 to 3 times to get all the clear off. The base coat acts as a primer coat, so you can just spray over that. But again, if you've never done it, don't ruin your car by trying to do it yourself with a cheap paint gun. You also need to buy the paint materials, which usually costs around 600 for all the base and clear coat you need, reducer, etc...