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Overlaid plywood offers a smooth surface due to the addition of a thin layer of material that is applied over the top of the plywood sheets, effectively masking the underlying grain patterns and knots. This results in a more uniform and aesthetically pleasing finish, which is particularly beneficial for applications requiring an appealing appearance, such as cabinetry or furniture. The overlaid surface not only enhances visual appeal but can also improve durability and resistance to moisture, making it suitable for various environments where a clean, refined look is desired.

Other types of plywood, such as structural plywood, softwood plywood, and composite plywood, typically retain visible grains and knots. Structural plywood is often used in construction for its strength and load-bearing abilities rather than its appearance. Softwood plywood is made mainly from softwoods and may have visible characteristics typical to the wood species used. Composite plywood involves combining wood fibers or veneers, which may not provide the same aesthetic finish as overlaid plywood. Thus, for achieving the smoothest surface and a seamless appearance, overlaid plywood is the clear choice.