Anti-Pee Paint — Hamburg, Germany
‘Wildpinkler’, or ‘wild pissers’, are such a problem in Hamburg’s red-light district that authorities have taken to coating its walls with Ultra-Ever Dry paint. Its superhydrophobic coating actively repels urine with a layer of air trapped along the wall’s surface, splashing it back onto the perpetrator’s clothes. Within months of the Hamburg pilot, similar schemes were set up in Cologne, London, San Francisco and Paris.