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I feel like I'm beating a dead horse but everyone is right. There are a lot of variables in this equation you have to consider.
What color is your primer, base and overall color you're looking to achieve? What equipment are you using? Is this is a color you're going to use for any other parts of the car like the interior or other bits? If this is your first time or something you can to reshoot, I'd probably get more. Having too much is better than having too little - especially if you make a mistake somewhere and don't have supplies readily available to immediately fix the issue before it snowballs into something much larger.
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