How do rainworks... work?
Concrete darkens when it gets wet. A superhydrophobic coating keeps surfaces from getting wet. By spraying our superhydrophobic coating through a stencil onto concrete, we create areas that will repel all water. The next time the surface gets wet, everything darkens except for where we sprayed, and the contrast between light (dry) concrete and dark (wet) concrete creates the image. Whenever it's dry, the rainwork will be completely invisible. Rainworks can be made on any surface that darkens when wet, including concrete, wood, stone, and some fabrics.
For more details on how to create your own rainworks, check out our official tutorial page.
Are rainworks bad for the environment?
Heavens no! Once dry, rainworks are completely non-toxic, environmentally safe, and biodegradable. The solvent in Invisible Spray means you should not pour it down the drain, but when used as instructed, its solvent evaporates and does not enter the water system.
How long do rainworks last?
On average, a rainwork lasts 2 to 4 months. We have had them last up to a year under the right conditions. The longevity of a rainwork depends on the type of concrete, amount of foot traffic, cleanliness of surface during installation, etc. A rainwork is the most vivid during its first couple of weeks, then slowly becomes more subtle.
Do rainworks make the sidewalk more slippery?
No, rainworks retain the same texture as the surface they are installed on.
Are rainworks legal?
According to a representative at the Seattle Department of Transportation, rainworks are legal on public sidewalks because they are temporary, don’t harm the property, and we don’t use them to advertise anything. See this article for the interview we are referencing. Basically, rainworks are classified the same way chalk art is. Check with your local government before making rainworks in your city.
What product do you use, and where can I get it?
We use a special superhydrophobic coating called Invisible Spray.
Note from Peregrine: When I came up with the idea for rainworks, I experimented with a variety of superhydrophobic coatings until I found the perfect formula for creating rain-activated art. I brought the idea to Kickstarter, and gained enough support through crowd-funding to set up distribution for this formula, now known as Invisible Spray! You can now order Invisible Spray here.
Do rainworks work in the snow?
Yes and no... A light snowfall will reveal a rainwork, but it only takes about an inch of snow to bury and hide it. To learn more about rainworks in the snow, check out this page!
Where can I find the MSDS?
The MSDS for Rainworks Invisible Spray can be found here.