How to Remove Previous Grit Scratches When Grinding a Knife

One of the biggest frustrations in knife making is finishing a blade, switching to hand sanding, and suddenly discovering deep scratches you thought were gone.

Unfortunately, those scratches didn’t magically appear.

They were there the whole time.

The good news is they’re easy to prevent.

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Every Grit Has One Job

Every time you change belts, the new grit has one job:

Remove every scratch left by the previous grit.

Don’t think about polishing the blade.

Don’t think about the final finish.

Your only goal is to completely erase the scratches from the previous belt before moving on.

If you skip this step, every finer grit becomes more work.

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The Dykem Trick

One of the simplest tricks I use is applying a thin coat of blue or red Dykem layout fluid before changing grits.

Coat the entire bevel with a light, even layer.

As you grind with the next belt, the Dykem disappears along with the scratches from the previous grit.

When all of the layout fluid is gone, you know you’ve covered the entire surface.

If you use another layout fluid or marker, make sure it goes on very thin. Thick coatings can bridge over deep scratches and give you a false sense that they’re gone.

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Don’t Rush to the Next Belt

Many beginners think finer grits remove scratches faster.

They don’t.

A 220-grit belt removes 120-grit scratches much faster than a 400-grit belt ever will.

If you still see deep scratches, don’t keep moving finer.

Go back one grit and remove them completely.

You’ll actually finish the knife faster.

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Change Your Grinding Direction

Another helpful trick is to slightly change your grinding direction with each grit.

The new scratch pattern crosses the previous one, making it much easier to see when every deeper scratch has disappeared.

Once all of the old scratches are gone, you can move to the next grit with confidence.

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Good Lighting Matters

Bright shop lighting makes a huge difference.

After each grit:

• Wipe the blade clean.
• Hold it under a bright light.
• Rotate it at different angles.

Deep scratches are much easier to spot before moving to the next belt than after you’ve spent another hour finishing the knife.

Taking thirty seconds to inspect the blade can save hours later.

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My Rule of Thumb

I never move to the next grit because the blade “looks pretty good.”

I move on only when I’m confident every scratch from the previous grit is gone.

That simple habit has saved me more time than almost any other grinding technique.

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Final Thoughts

Removing scratches isn’t about spending more time grinding.

It’s about spending your time at the right grit.

Use layout fluid to verify coverage, inspect the blade often, and don’t rush your grit progression.

A few extra minutes now can save hours of frustration later—and lead to a much cleaner finished knife.