What is intercoat adhesion, and when is light scuffing between coats recommended?

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Intercoat adhesion is the bonding between coats. Lightly scuffing between coats helps when the previous layer is glossy, because a smooth, shiny surface provides little grip for the next coat. Scuffing creates a tiny, mechanical key that allows the new layer to adhere better. This is also recommended if the product instructions call for it. If the surface isn’t glossy and the manufacturer doesn’t require scuffing, it isn’t needed. This isn’t about primer type, curing methods, or color matching.