Does a full-body paint job require removing the original paint?

[LilaFitz]

When repainting a car, the original paint needs to be sanded off for the following reasons: 1. Paint thickness: Repainting will increase the thickness of the paint layer; 2. Paint application area: The newly painted area will be higher than the original paint surface; 3. Peeling: The new paint may separate and peel after blending with the old paint; 4. New paint vulnerability: The new paint is prone to peeling during car washes; 5. Color mismatch: There may be color discrepancies. Post-painting precautions include: 1. Wax-stripping detergents: At car washes, ensure the staff does not use wax-stripping detergents to avoid damaging the paint; 2. Daily rinsing: Vehicles driven in coastal or heavily polluted areas should be rinsed daily; 3. Washing: Use clean, soft cloths or sponges to wash the vehicle, avoiding materials that might contain metal shavings or sand particles. Do not use dry cloths, towels, or sponges to prevent scratches.