A clipper blade consists of two metal pieces (or one metal piece and one ceramic piece) rubbing against each other thousands of times per minute. That friction causes the blade to heat up. Slower clippers and ceramic blades may get hot slower than other blades. However, all blades get hot eventually. In some clipper models, the body of the clippers can get hot after the motor has been running for a while. That can be quite uncomfortable on your hands. If the clipper body gets hot, there’s little you can do apart from taking a break to let them cool down for a while. To cool down hot blades, you should have a cooling spray such as Oster Kool Lube III Spray Coolant. The spray not only cools the blade but helps keep it lubricated, too. Another way to deal with hot clipper blades is to have spare blades handy (if you have clippers with detachable blades) and rotate through several blades throughout the grooming.