walls that pee back on you

deirdre

Senior Member.
so apparently San Francisco is trying a new paint cover that will bounce pee back on you if you try to pee on the wall.

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aside from the silly idea ("i left my shooooes in San ..Francisco") and high cost..

my question is, does this line from the manufacturer mean that DUST from the street will render the product ineffective? and how much dust are we talking?

Does the Ultra-Ever Dry®prevent powder accumulation on metal walls?

If there is no water or other liquid available to clean the coating, then the coating is not effective. It is not smooth or slick, it is actually a rough surface and may actually end up holding more powder in this application
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Ultra-Ever Dry®surface protection coating creates a solid/liquid contact angle of 160-175 degrees in air. Well-known windshield water repellents have a contact angle closer to 110 degrees and are only hydrophobic. A superhydrophobic
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http://www.spillcontainment.com/everdryfaqs

i know "rain-off" on your windshield lasts for quite a while, I'm assuming despite the dust.
 
I think you are correct, but why use the term "powder" instead of dirt or something else?

Powder accumulation will prevent the wall from being "superhydrophobic." Man, do I love the English language.
 
I think you are correct, but why use the term "powder" instead of dirt or something else?

Powder accumulation will prevent the wall from being "superhydrophobic." Man, do I love the English language.
theyre talking about metal application. so i assumed .. i dont know, does metal gather a different kind of 'dirt'?

i dont know enough about science, thats why im asking..ex i dont know what this means
Traditional sheet metal booth walls are conductive and attract charged powder particles that accumulate in thick
Content from External Source
maybe thats different then outdoor debris/dust. ??
 
seems like a catch 22 - you need water to clean off the dust (or powder), to make it work, yet it repels water because it's super hydrophobic. hmmm... maybe the water contacts the surface just long enough when you are hosing it down that it picks up the dust particles before rebounding and splashing back onto you :rolleyes:
 
So just aim lower, or a bit to the side.

I have doubts about its value as a deterrent, such a magic wall might be used as a toilet more often. I for one would be tempted to test its claim.
 
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