Open grain woods like oak, ash, and walnut present unique finishing challenges. Those beautiful pores that give these species their distinctive character can also trap air, cause uneven sheen, and make achieving a smooth surface frustratingly difficult.
Understanding how to work with open grain—rather than against it—opens up finishing possibilities that highlight wood’s natural beauty.
Understanding Wood Grain Structure
Trees grow in annual rings, producing alternating bands of earlywood and latewood. In ring-porous species like oak and ash, the earlywood contains large vessels that appear as open pores on the wood surface. These pores run the length of the board like tiny straws.
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