Our research team has developed a method for recording brain activities that enables the measuring of frequencies ranging from infraslow to conventional and up to ultrafast frequencies. This combination methodology is known as Full-band EEG (FbEEG). The method sets specific requirements to the recording amplifier and the electrode-skin interphase. In order to obtain high-quality DC-stable skin contact in FbEEG recordings, we have developed a special skin preparation method, SurePrep (video), which is now used worldwide in many clinical research laboratories focusing on sleep, epilepsy, and TMS-EEG (EEG combined with transcranial magnetic stimulation). More information on SurePrep with infants and adults is available through the links.