Which panel is sprayed with varying coats to help determine the correct number of midcoat applications for color matching?

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A let-down panel is used to test how color builds up with different numbers of coats, so you can determine the exact number of midcoat applications needed to match the target shade. By spraying varying coats on this panel, you can compare the resulting color to the reference and see how opacity, depth, and hue change with each layer, ensuring an accurate match before applying to the vehicle. The other panels serve different purposes: a blendable panel is for practicing edge blending, a color test sheet is for quick color comparisons on paper, and a shade sample is simply a reference color rather than a test of coat buildup.