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Film adhesion refers to the ability of a coating to adhere firmly to another coating or to the surface of a substrate through physical action or chemical reaction. It indicates the firmness between the paint film and the coated substrate. The coating thickness, drying conditions, substrate condition and properties directly affect the paint film adhesion. A paint film with good adhesion is durable and has the required performance; a paint film with poor adhesion is prone to cracking and peeling, and cannot be used.
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