Oster scissors, or clippers, are mainly used as grooming shears. When sharpened properly, the blades can last a very long time. The water from wet hair and the alcohol from the cleaning solution can dull the blades of the clippers. To prevent dulling and ensure a clean cut every time, the blades need to be sharpened on a regular basis.
Fill a large pot with light machine oil. Soak your sharpening stone in the oil overnight. Doing this will lubricate the stone, making sharpening quicker and easier.
Hold the scissors open in your dominant hand. Grasp onto the pivot of the clippers (where the two blades intersect), and position the first blade to be sharpened pointing down and resting on a hard surface. Hold onto the sharpening stone with your non-dominant hand.
Place the sharpening stone at the pivot of the blades. Using a smooth, straight motion, slide the stone from the pivot to the point of the blade. You do not need to apply a lot of pressure. Repeat the motion several times, keeping count of how many times the stone crosses the blade.
Turn the clippers around so that the second blade's point is facing downward resting on a hard surface. Repeat Step 3 with the second blade. Ensure that you slide the stone across the blade the same amount of repetitions as the first blade.
Open and close the scissors quickly as if cutting something. This will help knock off any shavings or burrs left on the blades. Wipe down each blade with a paper towel to clean off any oil that may remain on the blades.