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I was wondering if the droplets that came out from the nozzle are always positively charged as I watched some yt video and it was negatively charged. Is it because if the droplets are negative, after all the protons in the metal body have been attracted to the negatively charged droplets, and due to the immobile nature of protons, there will be a limit towards the amount of paint droplets that are attracted

is it possible to electrostatically charge two of the same materials by friction or would it just not result in electrons being transferred?