Which option describes the correct sanding direction relative to the grain?

• A. Across the grain
• B. Diagonally across the grain
• C. With the grain
• D. Against the grain

Answer: (C)

Sanding in the direction of the grain is best because it follows the wood fibers, reducing tear-out and leaving the surface smoother. The abrasive cuts along the grain, so fibers aren’t pulled up and cross-grain scratches are minimized. Sanding across or diagonally across the grain tends to lift fibers and create visible scratches that run perpendicular to or across the grain, which roughens the finish. Sanding against the grain pushes fibers toward the surface and can produce fuzzy texture and deeper scratches. So, move the sander with the grain and finish with fine grits to achieve the smoothest result.