how much paint do I need

2 gallons basecoat. Mix them together so they both match.

Want to have at least 2 quarts left over in case something happens to the car and you need to repaint the whole front or a complete side.

You want the color to match especially if it is a metallic. Nothing worse than a door repaint from a keyed scratch and it is the wrong color, sticking out like a sore thumb.

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Good Luck on your paint job.
This is same paint I got for my car. GREAT product!