What are the two main curing mechanisms in coatings?

The two main curing mechanisms in coatings are indeed non-convertible and convertible.

Non-convertible curing refers to the process where the coating hardens primarily through physical changes, such as solvent evaporation. In these systems, the coating may dry and form a film, but the chemical structure of the material does not change significantly. This is common in many conventional coatings where the primary mechanism involves solvents leaving the formulation, resulting in a hard surface.

Convertible curing, on the other hand, involves a chemical reaction that occurs during the curing process, leading to a transformation of the coating material into a more durable and chemically resistant form. This can involve processes like polymerization or cross-linking, which change the molecular structure and properties of the coating as it cures. Examples include urethane and epoxy systems that cure through chemical reactions, enhancing their performance characteristics.

Understanding these two mechanisms is crucial for selecting appropriate coatings for specific applications, as each type offers different benefits in terms of durability, resistance, and application methods.