The painting of metal signs is an important part in the production of signs, which directly affects the production efficiency and the final effect of the surface of metal signs. Different metal materials and different mask types often adopt different coloring methods. The common coloring methods include painting method, paint point method, paint scraping method, electrophoresis method, screen printing method, etc. The above methods are not universal coloring methods, and the coloring methods should be flexibly selected in combination with specific signs
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