A material that has undergone a chemical reaction to enhance its properties.

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A material that has undergone a chemical reaction to enhance its properties is a catalyzed material. When a catalyst or hardener is added to resin, it triggers curing through a chemical reaction—polymerization and cross‑linking—that turns the liquid into a solid with better hardness, adhesion, and chemical resistance. In automotive refinishing, many coatings are two‑part systems where the resin and hardener react together, creating a stronger, more durable film. This is different from an unreacted resin, which would remain soft; an inert filler, which adds bulk without changing the chemistry; or a dry pigment, which only provides color and does not improve physical properties through curing.