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Any damages to the car body, be they big or small, are hard and expensive to fix. I suggest to use memorized shape materials for the car body so that any damages, or just small one for the beginning, could be fixed instantly. Just push the button and the car body becames fresh new again.
Below is a demonstration of memorized shape memory alloy provided by Midé Technology - Engineering Smart Technologies.
About Shape Memory Alloys: A shape memory alloy (SMA, smart metal, memory metal, memory alloy, muscle wire, smart alloy) is an alloy that "remembers" its original, cold-forged shape, and which returns to that shape after being deformed by applying heat. This material is a lightweight, solid-state alternative to conventional actuators such as hydraulic, pneumatic, and motor-based systems. Shape memory alloys have applications in industries including medical and aerospace.