It is primarily used as a curing agent or hardener in epoxy chemistry. It can also be used as a hardener for certain epoxy resins. Obtained polymer is thermoplastic and require a curing agent or hardener to form a thermoset. It is primarily used as a crosslinker ("hardener") in epoxy curing. Color hardener is a powder pigment used to dye the concrete. A mix of structural resins and hardener is injected into foundation ground beneath footings. Its hardener is a peroxide, often MEKP (methyl ethyl ketone peroxide). Workers collected polyester resin products from multiple teams, which was mixed with a hardener. Araldite adhesive sets by the interaction of a resin with a hardener. Hexamethylenetetramine is a hardener added to crosslink novolac. The resin and hardener part together is known as the "Binder". The second most important part of FBE coatings is the curing agent or hardener. It is also used in paints as an activator or hardener. It was also used in gelatine emulsions in photographic film as hardener. In plaster, the flour paste serves as a binding agent and a hardener.