There is no one-size-fits-all answer to this question, as the amount of paint required depends on a number of factors. The type of car being painted, its size and the color will all affect how many cans are needed to finish the job. For example, a lighter color will require fewer cans of spray paint than a dark hue.
To determine how many cans of spray paint are needed, first figure out the square footage of the area you are going to cover. To do this, break the area up into a series of rectangles and measure the length and width of each one. Once you have the total square footage, multiply that number by the coverage per can of paint to find out how much paint is needed.
It is also important to choose a can of spray paint that will work for your specific needs. For example, if you are painting a vehicle with chrome accents, it is best to use spray paint that is specially made for automotive applications to ensure an even and smooth finish. Likewise, if you are repainting the wheels and calipers of a vehicle, using an aerosol that is specifically designed for these purposes will help to ensure a durable and weather-resistant finish.
It is also important to choose a well-ventilated and sheltered area in which to work. The fumes and overspray from spray paint can be dangerous if not properly handled, so be sure to wear a dust mask and safety goggles to avoid inhaling the particles. It is also a good idea to have a box of old magazines or newspapers nearby to catch any overspray that may fall on them.