What is block sanding?

• A. Using a sanding block to create a flat, even surface
• B. Sanding with hands only
• C. Using a belt sander on edge
• D. Sanding only curved surfaces

Answer: (A)

Block sanding is the process of using a sanding block to keep the sandpaper in a flat, true plane while you remove material, so you end up with a smooth, even surface. In auto body work this method levels filler and primer on panels, helping you reveal high spots and low spots and produce a straight, uniform finish. The block provides even pressure across the surface, preventing the creation of unintended dips or rounded edges that can happen with just your fingers or a power tool. For flat areas you’d use a rigid block to maintain a straight plane, while for curves you’d switch to a flexible or shaped block so the paper follows the contour without creating flat-spot distortions. This technique is preferred because it yields a surface ready for the next step, and it’s more controllable than sanding by hand without a block or using a belt sander on edge.