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A curing agent is a substance that is used to harden a surface or material. In the nail industry, a curing agent is used to harden adhesives, wraps, no-light gels, liquid & powder, and UV gels; all types of systems require a curing agent. In some of these systems, the curing agent is built within the products (l&p, UV gels). In others, the curing agent is added after the application (adhesives, wraps, no-light gels).