It is important to choose the right material for the part: a sheet of paper can be folded in any way, but a length of wood will snap with minimum strain. The above drawing largely explains our common experience, which tells us that thin material will bend better than thick material: the thicker the material, the more the outer surface of the bend is deformed, and the greater the risk that it will break.
Avoiding scratches during the handling & transport operations ; Avoiding scratches during the forming & assembly operations Protecting from stains and other pollutions (within workshops, on construction site etc.). To do so, the film is sufficiently resistant and adhere to the painted surface. In particular, the film is waterproof and impervious to many other liquids to avoid infiltrations.