I'm installing a set of Campagnolo Power Torque bearing cups on my bike. I am new to the world of Campy so I'm not sure if I should apply grease to the threads of the bearing cups, or not. Typically, when installing SRAM or Shimano bearing cups I would use grease on the threads, to reduce corrosion etc.

However, these Campagnolo bearing cups have some kind of yellow stuff on the threads. Does anyone know what this is? Should I still use grease on the cup threads?

Thanks.