Which material is specifically designed to flex and absorb impacts in auto body repairs?

Flexible filler is specifically engineered to bend and absorb impacts during auto body repairs. This material is crucial in applications where flexibility is needed, such as in areas that experience dynamic stresses or movements, allowing it to maintain a bond without cracking or breaking upon impact. Flexible filler is often used on plastic parts or sections of the vehicle that require a certain degree of movement, providing both durability and resilience.

In contrast, rigid filler would not be suitable in applications where flexibility is essential, as it is designed to create a hard, inflexible surface. Expandable foam is generally used for insulation and sound dampening rather than direct body repair and typically doesn't possess the necessary properties for impact absorption in high-stress areas. Structural adhesive, while useful for bonding various materials together, does not provide the same capacity to flex under stress compared to flexible filler.