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If the car needs to be painted completely, do you still have to scrape putty? What's the difference between a 4S shop and ordinary sheet metal?
Of course, putty keeps the smoothness of the car surface.

4s shop has smaller color difference, more expensive price and more thoughtful after-sales service.

The cheapest price is outside, but the color difference and after-sales depends on the boss's integrity.

It is best to do car paint in a regular shop. The color difference of car paint quality is mainly due to the sloppy craftsmanship of painters.