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Superhydrophobic coatings, like NeverWet, repel water to a very high degree. It does this by reducing surface tension by creating a very thin layer of air above the coating. Water beads up to almost a perfect sphere and rolls right off. The area around the image darkens in the rain, revealing your drawing.

You can use this to make innovative street art that only shows up when it rains or gets wet. (Make sure to get permission and follow all applicable laws in your area)

The downside of NeverWet is that it isn't perfectly clear: the surface becomes a translucent, frosty white that shows up on dark surfaces. However, it's nearly invisible on light-colored concrete.

Don't worry, it's not slippery at all. The surface of the coating feels indistinguishable from the texture of the concrete.

Here's what you'll need:

NeverWet - read the label for coverage to know how much you'll need. I did both stencils you see in this Instructable with one set of NeverWet cans. You can also source some industrial suppliers, which is what I was using before NeverWet became commercially available.

Drawing - Use your imagination!

Stencil - I used matboard because I had some around the studio, but it's not very durable. You can use chipboard cardboard, corrugated cardboard if you don't need a lot of detail, thin plywood or whatever else you can make a stencil from.

X-Acto knife - Or other means of cutting out your stencil, like a laser cutter or even a scrollsaw for plywood.

Spray Tack - (optional) I used this to get the stencil to stick to the ground so the edges wouldn't curl up. I got much cleaner lines this way.

Check out the videos for visual step-by-steps.

Step 1: Stencil

The first step is to make your drawing into a stencil.

I did my text and drawings in Illustrator, then printed them out at 1:1 scale using Illustrator's Tile setting (search Illustrator's help section if you're unfamiliar with this feature). I taped all the sheets together and then glued the paper to the matboard with spray glue. This gave me my template which I then cut out by hand. If you have access to a laser cutter this step will be much less aggravating.

I made one stencil as a positive ( I'm Only Happy When It Rains) and one as a negative (The Sun'll Come Out Tomorrow).

To arrange the pieces for the positive stencil, use the negative sheet you just cut from as a placement and registration guide, then spray tack the back of your pieces and stick 'em to the sidewalk (I did mine by laying them all out face down on some scrap newsprint and spraying the backs of everything at once).

I also used some scrap plywood as a border to contain the overspray.

Step 2: Spray

NeverWet is a 2-step process. A base coat and a top coat. Follow the instructions on the can label for coverage application and dry times between steps. Spray the first step evenly, wait for it to dry, then spray the second. You may need additional coats; again, follow the can's directions.

As you can see in the second image, the coating is faint, but basically invisible if you didn't know to look for it.

Step 3: Make It Rain!

Wait for it to rain, or splash some water on your new Rain Drawing!

The coating is rated to last for a year, then you may need to reapply the top coat. I made these drawings about eight months prior to writing this, and they're still there. They've gotten dirty and are not quite so invisible anymore, but the coating still works when it rains.

<p>Looks great. I like how it is &quot;hidden&quot; when it's dry and just visible when it's wet.<br>NeverWet is kinda hard to find here in europe. Are there alternatives that work equally well?</p>
<p>I found this with a quick Google search for &quot;superhydrophobic spray Europe&quot;: http://buyneverwetuk.co.uk/</p><p>There are a few other industrial suppliers of superhydrophobic coatings, not sure if they'll be any better for European shipping. Here are two I've found: </p><p>Hydrobead - I've used the aerosol spray, it's clearer than two part coatings but doesn't work as well <a href="http://www.hydrobead.com/#!shop--cart/c2jl" rel="nofollow" style="">http://www.hydrobead.com/#!shop--cart/c2jl</a></p><p>UltraEverDry - Haven't used this but they have several options for different materials <a href="http://www.ultraeverdrystore.com/" rel="nofollow" style="">http://www.ultraeverdrystore.com/</a></p>
<p>Some kind of spray wax? mold release?</p>
<p>Neither. Contrary to what you might think, it's not slippery at all. It has a matte surface texture.</p>
<p>Amazon's cheaper: </p><p><a href="http://www.amazon.co.uk/dp/B00KH0CTVG" rel="nofollow">http://www.amazon.co.uk/dp/B00KH0CTVG</a></p>
<p>Thanks, for the research. :D</p>
<p>this... this is so epic... how long does it last?</p>
<p>It's not super durable, especially on items that are smooth or flex, but I have some drawings on my driveway still from almost a year ago. And the two from the videos were made about 8 months ago and are still visible, though they've gotten dirty over that time from foot traffic so they're not so invisible anymore. They still repel water when it rains, though, and the image is still lighter than the wet concrete.</p><p>The edges have blurred, but if you still have your stencil according to the manufacturer you can re-apply the topcoat to refresh (though I haven't done that yet since I'm waiting to see how long the originals last).</p>
<p>It rains 200 days a year in Pittsburgh.</p>
We made this with amazing results using Rainworks Invisible Spray! Unlike NeverWet, Invisible Spray dries perfectly clear and has no sheen when dry.<br>We got it from www.invisiblespray.com!
<p>Has anyone tried this on Smooth Sand? Like at the beach?</p>
<p>Really cool. Does it get worn by scratches easily ? As in, would it rub off if you did that on a sidewalk and people walked on it ?</p>
Not easily, but eventually it will. It depends on how high traffic the sidewalk is, and how much direct sun it receives. It breaks down under uv light and would need to be reapplied. The company says after about a year. If there's a lot of traffic, it'll probably get dirty and become visible before it wears off. The two stencils I made outside my studio have lasted a few years. But, they're also under an awning and don't get a lot of direct sun, and it's not a super high traffic area. They're not as hydrophobic as they used to be, but they're still visible when they get wet.
<p>this is so cool!!! I need this!</p>
<p>That would be a fun way to hide a QR code.</p>
<p>Here's a good one to use :)</p>
<p>Neverwet is on sale at Home Depot for $10. I love it, however it does make fabric feel rough. Good art supply though.</p>
<p>Great idea! There is a gentleman who uses Tire Wet to create the same effect....it is cheap and leaves no visible residue behind ... </p><p>https://www.youtube.com/attribution_link?a=7mDeM_npyqs&amp;u=%2Fwatch%3Fv%3DtX8TE4Onsew%26feature%3Dshare</p>
<p>Very Cool! Love the result!</p>
<p>Neat, but in California where I live, it would never be seen!</p>
<p>That's so cool. Wonder if it will work on my pebblecrete driveway? </p>
<p>Congratulations on the contest win! This is such an amazing idea, and I love how thematic you kept your designs. Well done!</p>
How long does it stay on the cement?
if I paint this on a sidewalk will people stepping on it repeatedly wear it down quickly
Hard to say, probably not too quickly. More likely it will eventually get dirty and not be so invisible when dry.
<p>This is such a clever idea. The close-up shot is impressive. This stuff works so well.</p>
Did you buy the stencil or make it?
I made it.
<p>Perfect for Florida's rainy season!! Now what design to do???</p>
<p>Now to make sure my landlord doesn't visit on rainy days...</p>
<p>Wonder full. Is NeverWet transparent? Can it be used to coat windshield glass so no viper is required to be used in Rain?</p>
<p>No, it's not transparent and not recommended for transparent surfaces. Check the mfr. label.</p>
<p>Best idea ever! Is there any risk of it being slippery in wet shoes?</p>
<p>It's not slippery. It feels rough on concrete or cement.</p>
<p>Fantastic idea! :)<br>Same problem around my place: no such thing exist!<br>would clear coat on concrete work?</p>
<p>Not the same way NeverWet works. Search the internet, I bet you can find someplace that ships to your area.</p>
<p>Definitely cool!!! I was just wondering why the letters A, O, R, and P don't have the holes cut out. Was this done for a specific reason, or was it just easier for making the stencil?</p>
I like to play with the way type is represented. No reason other than I like the way they looked without the holes.
<p>I'm all over this. I'm going to make an enormous Steelers Logo in my driveway. And given that it rains 265 days a year here this is going to be epic. Ordered this from Amazon... $17.09 with shipping.</p>
<p>very neat. One of the cooler projects I've seen on instructables!</p>
<p>Wonder if this could be used on surfaces that are slippery when wet.. &quot;Caution, Slippery When Wet!&quot;</p>
<p>or better yet.. paint the whole slippery surface so no water will stay there!!!</p>
<p>This is great.. brings to mind writing obscenities on school lawn or football field with fertilizer!</p>
<p>That is really a fun idea. Thanks for sharing this with us. Living in area where it rains a fair amount and we have a lot of pedestrian traffic I think this would be an awesome mood lifter for those grey days. Loved the stencils too by the way. </p>
<p>&quot;I'm only happy when it rains&quot; The mantra of an overworked bulldozer operator.</p>
also a pretty bitchin song by garbage...
<p>There is something deeply satisfying about seeing this and thinking about what could happen if one created a piece using both neverwet stencil art and creative moss grafitti....!!<br>https://www.instructables.com/id/Moss-Graffiti/</p>
<p>Badassed. <br>Inventive.<br>Brilliant.</p><p>Clandestine.</p><p>Gotta love it.</p><p>Do more. </p><p>Please.</p>
<p>interesting!</p>
<p>lol would be prefect for washington wheather</p>

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Bio: Conceptual extended-media artist.
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