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Talc powder can be used in various industrial coatings, especially primers. Talc powder can be used in whole or in part in primers for steel structures, as it improves the sedimentation tendency of the coating, the mechanical strength of the film, and its re-coating ability. Talc is preferentially used in many products, flash-dry primers, and coatings for transportation vehicles. Flaky magnesium silicates, including talc, are suitable for metal primers due to their ability to improve sanding properties and water resistance; the water resistance may arise from the flaky particles blocking the pathways through which moisture can pass through the coating film. The influence trend of talc powder in coatings: As a filler, talc powder has a similar effect on both the elastic elongation and tensile strength of waterproof coatings: as the amount of filler increases, the variability in these properties increases; in both cases, there is an initial increase followed by a peak at which the maximum values are reached ； Then it shows a decreasing trend, and the optimal value is reached when it reaches a stable state. From a molecular perspective: when the amount of talc used is very small, particles without talc are dispersed among the macromolecular chain segments; as a result, the attraction between these macromolecular chain segments cannot be reduced. It becomes difficult for the macromolecular chain segments to move, which in turn results in a lower elastic elongation rate for the waterproof coating. As the amount of talc used increases, its small particles continuously fill in the spaces between the polymer chains, thereby enhancing the movement of these chains and increasing their elastic elongation. When the inorganic small particles of talc completely fill the gaps between the polymer chains, the waterproof coating has the fewest defects in its curing structure, and at this point the tensile strength and elongation of the waterproof coating reach their optimal values.