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As in the arteries, the walls of veins have three layers, or coats: an inner layer, or tunica intima; a middle layer, or tunica media; and an outer layer, or tunica adventitia. Each coat has a number of sublayers.
It depends on the texture of the wall and how many coats you apply. For textured walls, there is more surface area and you will have to apply two coats so a gallon will only cover 200 square feet. For normal walls, it will cover about 400 square feet, add a comment.