You’d probably remember the glue if they used it. I worked in an office with an EEG tech and she only liked to use glue. It stinks of chemical fumes when applied and is tough to get out. I don’t think it’s the preferred method but was her preference.
There was a younger tech that would help with the take home video EEG tests. He wrapped people’s heads as you’ve described. Any way it’s done people are usually very happy to be free of it. :)