Sharpening Razor Blades This clever little honing pad reduces your use of plastic cartridges and double edge razor blades, drastically lowers shaving costs and reduces your carbon footprint. Follow these steps to sharpen your Gillette Mach3 or Gillette Fusion cartridge: IMPORTANT! Dip the honing pad into warm water for 2 to 3 seconds to moisten the leather. This allows the retaining clips — which hold the cartridge blades in place — to lower into the leather so blades touch th … read more