Many earlier studies have shown a general relation between the surface properties of wood and coating performance. However, because of the multitude of chemical and physical interactions, and the effect of the surface structure on its wettability as well as on the penetration, the adhesion and durability of a coating may be different depending on the specific combination of wood species and coating materials. Important analogous findings are also known from wood bonding. Repeated reference is made to the danger of adverse effects of machining operations in the form of serious cell damage in the surface layer. Reports of compressed and torn wood fibres on the surface of softwoods are particularly frequent (see Figure 1).
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