To use a whetstone you run the knife's blade back and forth across the stone's surface and due to the constant friction with the stone, which acts like a piece of sandpaper, the knife's edge becomes razor sharp and has a brilliant mirror shine. If you are a beginner at using a whetstone it can a take a while to master the sharpening process, so here is a video to help you with your sharpening stone skills.
Grit choices should fall in line with the steel used to make the knives you plan to sharpen. If your knives are all European, relatively soft steel knives, then you could finish off your knives at the 1,000 – 2,000 grit level. There is a lengthy explanation regarding this topic but suffice it to say that at 2,000 grit, these knives can be made extremely sharp.
Some stones need water, while other stones need oil for floating the swarf (small metal filings created when sharpening) away. Simply apply a few drops of either oil or water directly to the stone. (We recommend using an inexpensive spray bottle for applying the water.) The lubricant you need is determined by the type of stone you are using. Water stones and diamond stones require water. Oil stones such as India, Crystolon and Arkansas stones use oil for a lubricant.
Rest your knife on the stone at your chosen angle. An easy method for determining the angle by eye is to visualize a 45 degree angle and then take half that amount. That will give you a ballpark estimate of the angle and then you can adjust accordingly up or down. With a slicing action bring the length of the knife across the stone with a motion that starts with the heel of the knife on the stone and ends with the point of the knife. The motion should resemble a sweeping arc pattern across your stone. Be very careful to maintain the angle of the knife on the stone. Longer curved knives provide additional challenges but as long as you can maintain the angle you will be sharpening very effectively. Repeat this process on the other side of the knife and continue repeating until you have sharpened your knife though all your stone grits.
Place the index and middle finger of your other hand on the tip of the blade. Apply pressure and swipe the blade down in a pulling motion. Release pressure, and move the knife back up to your starting point. Apply pressure only when stroking down; otherwise, you’ll risk cutting into the stone. Repeat the up-and-down swiping motion; with each swipe, inch your two fingers along the blade, in the direction of the heel. When you’ve reached the heel of the blade, use the index finger of the opposite hand (which should already be placed on the heel) for extra support. Run a finger along the opposite edge of the knife. There should be a slight ridge, or burr.

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For instance, if you have a kitchen knife with a strong blade that has a hardness rating of 58 HRC in the Rockwell scale such as the knives from the popular Wusthof Classic series, you'll need a sharpening stone with fine grit. On the other hand, if your knife has a lover level of hardness such as 53 HRC, then you will need a whetstone with coarse grit.
Your whetstone will most likely be double-sided with a coarse and a fine grit. The grit is determined by the number of sand-like particles in the stone. The coarse grit will have fewer particles, whereas the finer grit will have more grains. Both sides are utilized to effectively sharpen a blade. The coarse grit, usually a deeper color; red or gray, will pre-sharpen the blade and remove any burrs or discrepancies in the blade. The finer grit is then used to hone and polish the blade, creating a finished edge.
The Juuma sharpening and honing stones offer a simplified working principle while at the same time ensuring the highest possible quality in the offered grits. Juuma Cobalt Blue stones are made of an aluminium oxide and a bonding agent. Adding cobalt serves to slow stone abrasion and increase the speed of sharpening. The speed bonus is especially marked when stoning blue steel (blue paper steel that is often used for Japanese planes and chisels). The cobalt gives the stones their blue colour. Juuma is our proprietary brand. Juuma sharpening stones are produced by a renowned Japanese whetstone manufacturer.