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The city's Public Works agency is testing a pee-repellant paint on walls in areas that have been saturated with urine. Anyone urinating on the specially treated walls will get the spray splashed back onto them.

San Francisco's director of public works, Mohammed Nuru - whose Twitter handle is @MrCleanSF - got the idea when he read on social media about the use of the paint in Hamburg, Germany's nightclub district to stop beer drinkers from relieving themselves in the street.

Use a pit stop instead of walls, bus stops and sidewalks or you may be surprised by the anti-wee painthttp://t.co/nxZNRHwhjt
The paint, called Ultra-Ever Dry, is sold by Ultratech International Inc and is billed as a superhydrophobic coating that will repel most liquids.

"The urine will bounce back on the guys pants and shoes. The idea is they will think twice next time about urinating in public," said Rachel Gordon, a Public Works Department spokeswoman.

She said the super-hard coating made the "bounce back" effect much stronger than when peeing on a regular wall.

In a pilot program, San Francisco last week painted nine walls in areas around bars and other areas with big homeless populations.
"Hold it! ... seek relief in an appropriate place," say signs posted near the paint. The signs are in English, Chinese and Spanish.