Which operation uses a flat sanding surface to ensure uniform finish on a large panel?

Which operation uses a flat sanding surface to ensure uniform finish on a large panel?

• A. Feather edging
• B. Block sanding
• C. Guide coat application
• D. Primer application

Answer: (B)

Using a flat sanding surface, like a sanding block, is essential for a uniform finish on a large panel. The rigid block keeps the sandpaper perfectly level and evenly distributes pressure, preventing dips, waves, or uneven texture as you work across a big area. This flat, consistent contact is much harder to achieve with just your hands, which helps you realize a smooth, planar surface from edge to edge. While feather edging blends repaired edges, guide coat highlights low spots for sanding, and primer application prepares the surface, none of those tasks ensures the entire panel remains perfectly flat like block sanding does.