Answer
Sandpaper can refine a knife edge when fixed to a flat backing. Use 400 or 600, then 1000, 2000, or 3000.
Why it happens
Sandpaper can abrade steel, but sharpening needs a stable backing and consistent angle.
Recommended grit
Use 400 or 600 for edge work, then 1000, 2000, or 3000 for finer refinement.
Wet or dry
Dry or wet depending on backing and method.
Success check
The edge is refined evenly with no rolled or uneven bevel.
What to do
- Attach the paper to a flat backing.
- Hold a consistent sharpening angle.
- Start with 400 or 600 only if the edge needs work.
- Refine with 1000, 2000, or 3000.
Avoid: Do not freehand on loose paper without angle control.