How to sharpen a knife using sand paper?


How to Sharpen a Knife Using Sandpaper

Sharpening a knife is an essential skill for any chef, outdoors enthusiast, or DIY enthusiast. While there are various methods and tools available for sharpening knives, one cost-effective and accessible option is using sandpaper. Sandpaper, also known as abrasive paper, is a versatile tool that can be used for a wide range of applications, including sharpening knives. In this article, we will explore the step-by-step process of sharpening a knife using sandpaper, the different types of sandpaper available, and some tips and tricks to achieve a razor-sharp edge.

Understanding Sandpaper

Sandpaper is a coated abrasive material that consists of a paper or cloth backing and abrasive particles bonded to it. The abrasive particles can be made of various materials, such as silicon carbide, aluminum oxide, or garnet. The particles are graded based on their size, which is referred to as the grit. The lower the grit number, the coarser the sandpaper, while higher grit numbers indicate finer abrasives.

When it comes to sharpening knives, it is recommended to use medium to fine grit sandpaper. Coarse grit sandpaper can remove too much material from the blade, while ultra-fine grit may not provide enough abrasion to effectively sharpen the knife.

Step-by-Step Guide to Sharpening a Knife with Sandpaper

Now that we have a basic understanding of sandpaper, let’s dive into the step-by-step process of sharpening a knife using this versatile tool.

Step 1: Gather the Necessary Materials

Before you begin sharpening your knife, make sure you have the following materials:

  • Sandpaper sheets (medium to fine grit)
  • A flat surface, such as a table or countertop
  • A cutting board or piece of wood
  • A towel or cloth
  • A lubricant (optional)

Step 2: Prepare the Sandpaper

Start by cutting the sandpaper into a size that can comfortably fit on the flat surface. You can use a sanding block or simply hold the sandpaper with your hand. If you are using a sanding block, make sure it is clean and free from any debris that could scratch the knife blade.

Step 3: Secure the Sandpaper

Place the sandpaper on the flat surface, ensuring it is firmly secured. You can use double-sided tape or clamps to hold it in place. Alternatively, you can attach the sandpaper to a piece of wood or a cutting board for added stability.

Step 4: Determine the Knife Angle

Before you start sharpening, it is important to determine the angle at which you will be sharpening the knife. The angle will depend on the type of knife and its intended use. As a general guideline, a 20-degree angle is suitable for most kitchen knives, while a 25-degree angle is better for hunting or outdoor knives.

Step 5: Lubricate the Sandpaper (Optional)

Applying a lubricant, such as water or honing oil, to the sandpaper can help reduce friction and prevent the blade from overheating. This step is particularly important when using finer grit sandpaper. However, if you are using wet/dry sandpaper, you can skip this step as it is designed to be used with water or oil.

Step 6: Start Sharpening

Hold the knife firmly with one hand and place the blade against the sandpaper at the desired angle. Using light pressure, move the knife back and forth along the length of the sandpaper. Make sure to maintain a consistent angle throughout the sharpening process.

It is important to note that when sharpening a knife, you should always move the blade away from your body to avoid accidents or injuries. Take your time and be patient, as rushing the process can lead to uneven sharpening or damage to the blade.

Step 7: Test the Sharpness

After a few passes on the sandpaper, it’s time to test the sharpness of the knife. Carefully run your finger along the blade’s edge, taking caution not to cut yourself. If the blade feels dull or rough, continue sharpening with the sandpaper. If it feels sharp and smooth, move on to the next step.

Step 8: Hone the Edge

Once you have achieved the desired sharpness, it is recommended to hone the edge of the knife to further refine and polish it. Honing helps remove any burrs or imperfections left by the sharpening process, resulting in a smoother cutting edge.

You can use a leather strop or a honing rod for this step. Simply run the blade along the strop or rod, maintaining the same angle as during sharpening. Repeat this process a few times on each side of the blade.

Step 9: Clean and Dry the Knife

After sharpening and honing, it is important to clean and dry the knife thoroughly. Use a damp cloth or towel to remove any metal shavings or residue from the blade. Make sure the knife is completely dry before storing it to prevent rusting.

Tips and Tricks for Sharpening with Sandpaper

Sharpening a knife using sandpaper can be a rewarding and cost-effective method. Here are some additional tips and tricks to help you achieve the best results:

  • Start with a coarser grit sandpaper if your knife is very dull or damaged. Gradually move to finer grits for a polished edge.
  • Use a consistent angle throughout the sharpening process to maintain an even edge.
  • Apply light pressure when sharpening to avoid removing too much material from the blade.
  • Regularly clean the sandpaper to remove metal particles and debris that can affect its effectiveness.
  • Consider using a sandpaper sponge for sharpening curved or irregularly shaped blades.
  • Experiment with different grits and techniques to find the best method for your specific knife.


Sharpening a knife using sandpaper is a cost-effective and accessible method that can yield excellent results. By following the step-by-step guide outlined in this article and incorporating the tips and tricks provided, you can achieve a razor-sharp edge on your knives. Remember to choose the appropriate grit sandpaper, maintain a consistent angle, and take your time during the sharpening process. With practice and patience, you can become proficient in sharpening knives using sandpaper, ensuring your blades are always ready for any cutting task.

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