Which term best represents an additive that initiates or accelerates chemical reactions in coatings, as listed among typical hardeners and catalysts?

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In coatings, curing is a chemical reaction that is started or sped up by specific additives. An activator begins or triggers the reaction, a hardener provides reactive groups that form the crosslinked network, and a catalyst increases the reaction rate without being consumed. The reason this combined term fits best is that it covers all the common roles used to initiate or accelerate curing in coating formulations, reflecting how these components are typically described together in practice. Other terms are less precise: an accelerant isn’t a standard coating label, a promoter isn’t the usual term for these additive roles, and an initiator is usually specific to starting polymerization rather than covering the broader curing system.