# In San Francisco, back-alley walls pee on you.

**URL:** <https://boards.straightdope.com/t/in-san-francisco-back-alley-walls-pee-on-you/726268>\
**Category:** Miscellaneous and Personal Stuff I Must Share\
**Created:** [July 26, 2015, 10:02pm UTC](https://boards.straightdope.com/t/in-san-francisco-back-alley-walls-pee-on-you/726268 "2015-07-26T22:02:02Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Senegoid](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/senegoid/32/6606_2.png) [@Senegoid](https://boards.straightdope.com/u/Senegoid)\
**Post date:** [July 26, 2015, 10:02pm UTC](https://boards.straightdope.com/t/in-san-francisco-back-alley-walls-pee-on-you/726268/1 "2015-07-26T22:02:02Z")

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[Urine-Proof Paint Returns Fire On Peeing Perps](http://www.huffingtonpost.com/entry/urine-proof-paint-san-francisco_55b3bacfe4b0074ba5a4c53d?ncid=txtlnkusaolp00000592)

Borrowing a technique used in Germany, some particularly pee-prone hot spot walls are being painted with some new-fangled paint that is so water-repellant that any pee squirted on it gets bounced right back at the source.

Tickets and fines didn’t work (like, homeless dudes can pay fines?), but the city is hoping this might.

> [@](#):
>
> San Francisco is peeing back at public urinators by painting its walls with UV-coated, urine-repellent paint, local TV station KPIX reports. The paint is so hydrophobic that it keeps the wall clean and sprays urine right back at offenders.

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**Author:** ![wolfman](https://avatars.discourse-cdn.com/v4/letter/w/a8b319/32.png) [@wolfman](https://boards.straightdope.com/u/wolfman)\
**Post date:** [July 26, 2015, 10:08pm UTC](https://boards.straightdope.com/t/in-san-francisco-back-alley-walls-pee-on-you/726268/2 "2015-07-26T22:08:55Z")

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Sounds like an opportunity for a bank shot on your friend’s shoes.

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**Author:** ![cochrane](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/cochrane/32/10441_2.png) [@cochrane](https://boards.straightdope.com/u/cochrane)\
**Post date:** [July 26, 2015, 10:35pm UTC](https://boards.straightdope.com/t/in-san-francisco-back-alley-walls-pee-on-you/726268/3 "2015-07-26T22:35:20Z")

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I love the animated image with the pee splashing back on the guy on the right’s shoes.