Just apply a simple drop of this Wahl oil to clip on the teeth of the blade and leave it to spread the oil well, and you're done! It's recommended to apply oil when the clipper and blade work is done and you're ready to put the unit away to keep your blades from rusting. If too much oil is put on the clipper blade during operation, a paste can form on the blade that will damage your cut, which is why products such as blade ice is used during cutting to act as the oil and to cool it down. However, oil remains an essential element for any groomer at the end of their work.