Which layer is applied last to provide protection and gloss in a typical automotive paint finish?

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Clearcoat is the protective, glossy final layer. It goes on last, after the primer and the color layers, and forms a hard, transparent film that seals in the color while providing UV resistance, chemical resistance, and abrasion protection. This layer gives the deep, high-gloss finish that makes the paint look vibrant and durable. Primer creates the adhesion and corrosion protection for the bare metal, while the basecoat provides the color; in typical modern automotive finishes, the clearcoat sits atop these to deliver both protection and the final shine.