Shapton Stones – FAQ

Do Shapton stones need to be soaked before use?
Shapton stones are splash-and-go, so they don’t require soaking before use. For first-time use, a short soak (5–6 minutes) can improve smoothness. Do not soak them for more than 30 minutes, as it may soften the stone.

Which side of the Shapton Kuromaku stone should I use?
Use either side, but it’s best to start on the blank side (the one without printed letters) for a cleaner surface.

What types of blades can I sharpen with Shapton stones?
Shapton stones work on most blade materials, including carbon steel and stainless steel. However, they are not suitable for ceramic blades or some superalloys.

Can I sharpen a knife with chips or a damaged edge?
Yes. Use a coarse stone (#120–#320) to repair chips, then progress through finer grits to refine the edge.

In what order should I use Shapton sharpening stones?
Always start with a coarse grit for shaping or repair, then move to medium and fine stones for refinement and polishing.

Does a buildup of slurry create any problems when sharpening?
It is fine to sharpen blades without washing away the slurry, but as Shapton sharpening stones have a high abrasive content, they can be used equally well with no slurry present.

Which Shapton stones are recommended for household knives?
The #1000 (Orange) is great for regular maintenance, while the #5000 (Wine) is ideal for finishing. The #1500 (Blue) is a good all-purpose option if you only use one stone.

Why is my stone slipping or not cutting well anymore?
It may be clogged or uneven. Use a lapping plate or flattening tool to restore the surface for optimal performance.

My fine Kuromaku stone feels soft. What happened?
Over-soaking, exposure to moisture from bases, or use of detergents can soften the stone. Flatten the surface using lapping powder to restore its original hardness.

Can I use sandpaper to flatten a Shapton stone?
No, sandpaper may clog the stone and reduce performance. Always use a proper flattening or lapping plate.

Is hot water safe for sharpening?
No. Avoid using hot water, as extreme temperature changes may cause cracks in the stone.

I found some uneven color or spots on the surface of my new Shapton stone. Is that a defect?
No, that’s completely normal. Slight discoloration, spots, or uneven color patterns are natural in sharpening stones and do not affect performance. It’s not a defect, and you can use the stone without concern.