2004 can quickly and effectively reduce the surface tension of the system, wet the substrate, spread on the surface of the substrate. It can wet the surface of metal, glass, and plastic etc. Even if the surface of substrates is dusty and oily, it can wet them well and will not stabilize foam but contribute to defoam and anti-foam. It can improve uniform coating without appearance of fish holes or small pinholes and improve leveling. This product is resistant to acid and alkali, it has good compatibility, and can improve water affinity of the products and increase the products solubility in water.