Moisturizing curing with plastic film is a kind of curing method that seals the concrete surface with anti-evaporation materials to prevent the water in the concrete from evaporating, so that the concrete can be kept at or near saturation state and the hydration reaction of cement can be carried out normally.

The wet curing classification of plastic film can be divided into:

1. Plastic sheet curing: cover the concrete surface with plastic sheets to cure the concrete.

2. Film curing agent curing: It is a curing method that after spraying a layer of liquid film curing agent (also known as film curing liquid) on the surface of newly poured concrete, the curing agent can quickly form a waterproof sealing film layer on the surface of concrete to prevent the water in concrete from evaporating and make the cement in concrete fully hydrated.