Which statement about automotive plastics is incorrect?

The statement that "all automotive plastics can be welded" is not accurate. In the automotive industry, various types of plastics are utilized, each with unique characteristics and behaviors when subjected to heat. While some plastics are thermoplastics and can be welded, others are thermosets, which do not melt and re-form when heated; therefore, they cannot be welded. This diversity means that it is not correct to claim that a universal welding method applies to all automotive plastics.

In contrast, the other statements provide correct information. Certain plastics can indeed be repaired by applying heat, as this can allow the thermoplastic materials to soften and be reformed or adhered together. Additionally, specific adhesives are required for effective repairs on different types of plastics, reflecting the need to understand the compatibility of adhesives with various plastic materials. Lastly, acknowledging that different plastics possess distinct properties highlights the importance of material knowledge in auto body repair, affecting how repairs are approached and executed.