We recently saw this in The I newspaper (UK) on the ongoing problem of people peeing in the street:
Urine Trouble: San Francisco’s anti-pee paint makes a splash- By Henry Austin
People urinating in public are likely to hit themselves in the Californian city of San Francisco, where nine walls have been painted with a repellent that makes it spray back on the offender.
Coated with a clear, liquid-repellent material that goes on much like paint, when the walls are hit with urine, itsplashes back on a person’s shoes and pants.
Signs hanging above some walls read: “Hold it! This wall is not a public restroom. Please respect San Francisco and seek relief in an appropriate place.”
Mohammed Nuru, the director of San Francisco’s public works department, said offenders will need to make the mistake only once to get the idea. “If you have to go, go in the right place,” he said.
Public urination has long been a problem in San Francisco, where a light pole corroded by urine recently fell on a car. Nuru said he got the idea from Hamburg in Germany.