Curing agent is a polymer material, which is sprayed on the surface of concrete to solidify into a film, greatly reducing the evaporation loss of water on the surface of concrete. The spraying amount depends on the product and the effect to be achieved, and should be determined according to the product description or test.

The purpose of curing agent is to protect concrete, because the surface of concrete loses water during the hardening process, and the concrete will shrink and produce cracks, which are called plastic shrinkage cracks. Before the final setting of concrete, it is impossible to spray water for curing, so using curing agent is a better choice. Some concrete structures are difficult to be wetted by water, and can also be protected by curing agent.

Concrete curing is surface moisturizing, and the essential function of curing agent is "protection" rather than "curing", because the concept of curing is to prevent concrete from losing water, replenish water, help cement hydrate and make its strength grow healthily.

The use or non-use of curing agent is mostly based on the difficulty of implementation and the comprehensive cost of maintenance. In fact, they are useful all over the country.