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A top coat in the beauty realm refers to a protective finishing layer applied atop other products, such as nail polish or bronzers. Its primary function is to enhance durability and prolong wear, while also imparting a glossy or matte finish depending on the desired effect. Top coats serve as a barrier against external factors that may cause fading, chipping, or dulling of underlying products. They can be clear or tinted and are available in various formulations to cater to different needs and preferences within the beauty industry.