Which materials are commonly used as auto body fillers?

Auto body fillers are materials specifically designed to repair dents, scratches, and imperfections in the surface of vehicles. The correct choice highlights epoxy, polyester, and urethane compounds as these are the most widely used materials in the auto body repair industry for filling and smoothing the surface of vehicle panels.

Epoxy fillers are known for their strong bonding properties and durability, making them suitable for a wide variety of repairs. Polyester fillers are popular due to their good workability and quick curing times, as they allow technicians to sand and paint the surface relatively quickly after application. Urethane fillers are also used because of their flexibility, allowing them to expand and contract with the vehicle body without cracking.

In contrast, the other options do not provide suitable materials for auto body repairs. Wood and metal shavings are not practical as they do not create a smooth surface nor offer adequate bonding properties. Tar and sand lack the necessary structural integrity and performance to effectively fill and repair auto body surfaces. Concrete and plaster are too heavy, brittle, and not designed for the dynamic environments that vehicle bodies endure, making them unsuitable for auto body repairs.