Which material is used to remove scratches from the surface or edges after filing on metal or plastic?

• A. Wet and dry paper
• B. Metal polish
• C. Twist drill bit
• D. Bench sheers

Answer: (A)

Finishing a metal or plastic surface after filing relies on abrasion to erase the marks left by the file. To remove scratches and create a smooth edge, you use an abrasive material that can progressively wear away the ridges. Wet and dry paper, or sandpaper, is designed for this purpose. It comes in different grits and can be used with water to reduce heat and prevent clogging, letting you start with a coarser grit to level the scratches and finish with finer grits for a smooth surface. This makes it the best choice here. The twist drill bit and bench shears are for cutting or making holes, not smoothing surfaces. Metal polish is mainly for shining and removing very fine surface blemishes after sanding; it doesn’t remove the raised marks from filing as effectively as abrasive paper does.