Is the original factory paint completely removed when repainting a car door?

[StWalter]

During a full repaint, the paint needs to be completely sanded off. For touch-up painting, the sanding area will also be expanded to ensure the adhesion of the new paint and prevent peeling. Below is relevant information: 1. Two scenarios: Generally, car door repainting doesn't require door removal. Other areas are covered with newspaper beforehand before painting begins. However, if the entire door is severely damaged and requires complete repainting, the door can be removed for respraying. 2. Precautions: When selecting paint before repainting, it's recommended not to choose quick-drying paint. Although this type of paint is more convenient, over time it becomes prone to peeling. After all, this paint will age differently from the original factory paint, leading to various issues. Also, avoid repeatedly applying paint layers, as over time it will continuously peel like dry skin, affecting appearance.