If degassing and substrate wetting are required, medium or high molecular weight acrylic leveling agents should be selected.

In the primer, if stronger substrate wettability is required, consider using silicone leveling agents and modified acrylic leveling agents (such as fluorine-modified acrylic leveling agents and phosphate ester modifiers) that can significantly reduce surface tension. Acid acrylic leveling agent), if the silicone leveling agent and fluorine modified acrylic leveling agent appear to stabilize the foam, affecting interlayer adhesion and other side effects, phosphate ester modified acrylic leveling agent should be used.

In the topcoat and transparent paint formulations, the appearance of the paint film is relatively high. Generally, a low molecular weight acrylic leveling agent can be used. In this way, good leveling properties will be obtained, and haze will not easily occur in the paint film.

In cross-linking curing systems, acrylic acid leveling agents containing reactive functional groups are often used to obtain better leveling properties, while improving the physical and chemical properties of paint films. If a paint film is required to have better flowability or slip and scratch resistance, a silicone leveling agent is necessary. In this case, it is best to use a silicone leveling agent in combination with an acrylic leveling agent. It should be noted that, when applied in a vertical plane, the silicone leveling agent provides leveling performance and can effectively reduce the tendency of the coating to sag.

In addition, in metal glitter paint formulations, silicone leveling agents should be used with caution, because it may cause uneven arrangement of flake aluminum pigments and cause uneven paint film color.