The substance added to automotive patching compounds initiates a chemical reaction, transforming the initially pliable material into a rigid and durable solid. This component, typically a peroxide-based compound, facilitates the cross-linking of polymer chains within the filler, resulting in a hardened mass suitable for sanding and painting. Without its presence, the body filler would remain soft and unusable for automotive repairs.
This additive is critical for achieving long-lasting and structurally sound repairs to vehicle body panels. Its inclusion ensures that the repaired area can withstand the stresses of daily use, resisting cracking, shrinking, or detachment. Historically, advancements in its formulation have led to improved curing times, increased strength, and enhanced compatibility with various types of body fillers, significantly improving the efficiency and quality of auto body work.