Some systems have sensors for the vapors that the solvent in the cans produces. The sensor triggers a silent alarm or something like that. Water based paint doesnt produce these vapors.
@@fragnichtwasfursaft.1934 Mainly it is so that the security people do not smell you or because you paint somewhere close to a station and you do not want the smell of paint to reach there, since water-based paint does not emit an odor.
