In addition to the coatings with superior performance and advanced coating processes that affect the quality of the tinplate coating layer, the viscosity of the coating will also have a great impact on the thickness uniformity of the coating, so the control of the coating viscosity also appears to be quite important. Different coating viscosities will have different coating layer thicknesses under the same conditions. The higher the viscosity, the thicker the coating will be after coating with the same amount of coating; this aspect improves the protective performance of the coating, but the mechanical processing performance will be reduced, prone to poor curing, insufficient adhesion, and coating turtles. Cracking and shedding. At the same time, the leveling of the coating is reduced, the coating film is unevenly coated, and defects such as "wrinkle" are prone to occur. Conversely, the lower the viscosity, the thinner the coating thickness, the worse the abrasion resistance and adsorption.