The outer surface paint is made of materials with strong adhesion, weather resistance and durability; the inner surface paint is made of materials that are compatible with the interior. Through years of experiments in the barrel-making industry, most of the exterior surface coatings currently use amino baking enamel. This kind of paint can basically meet the requirements of the standard "material with strong adhesion, weather resistance and durability". For small batch production or companies that do not have coating equipment and drying equipment, other paints, such as alkyd paint and epoxy paint, are also used, but the effect is far not as good as amino drying paint. The inner surface coating is generally required to be compatible with the contents, and cannot react with the goods, deteriorate the goods or make the inner coating invalid. There are two types of food internal coatings and chemical special internal coatings, both of which have strict requirements.
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