What are the methods for detecting the paint surface of a used car?
2 Answers
Here are the common methods for detecting the paint surface of a used car: 1. Use the color difference between various body cover parts to make a judgment. 2. Observe whether the car's paint surface has an orange peel effect by using the reflection principle. 3. Check for sand holes or bubbles on the paint surface by close observation. 4. Determine if there is a sagging phenomenon on the paint surface through close observation. 5. Inspect whether there is overspray on the car's rubber strips and other accessories. 6. Use modern detection tools such as a paint thickness gauge to measure the car body; a reasonable and normal detection value should be between 90～120βm; some luxury vehicles may have thicknesses greater than 120.
When buying a used car, paint inspection is my top priority. I choose a sunny time, walk slowly around the car, and carefully check for color consistency—any color difference could indicate repainting. I gently run my hand over the surface to feel for bumps, dents, or rough spots, as a proper paint job should be smooth, and irregularities may suggest body filler repairs. Using a strong flashlight, I look for uneven reflections that reveal touch-up marks. The magnet test is also practical: if a magnet doesn’t stick to certain areas of the metal body, it suggests non-metal filler, often a sign of accident repairs. Finally, I inspect seams like door edges or hood gaps—factory paint is clean and precise, while repainting may appear messy or show overspray. These methods have helped me avoid problematic cars, saved repair costs, and improved driving safety. I recommend spending extra time on this step.
