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Article : An intro for beginners: Why paint cracks and how to avoid it: "If your first layer of paint is very thick and you add a thin layers on top of it before it is totally dry it will crack all the layers thereafter, and as it continues to dry the cracks will get bigger - especially if the color on top is darker. Painters prevent this by painting the thick slow drying layers last and usually begin with thin fast drying paint - as a background."