It is pure poison and lasts a short time. Yaaaaa, let's all buy some.
I copied the following from a site that tested it.
The Ultra-Ever Dry coatings in their liquid state are based on
xylene (bottom coat) and
acetone (top coat) and emit powerful amounts of fumes. Applying the coatings to anything inside a house or apartment
is absolutely out of the question. Even outdoors, coming anywhere near the stuff requires nitrile gloves and a P100-rated
respirator fitted with
organic vapor filters.
Bottom line: if you're planning on getting some Ultra-Ever Dry for yourself and applying it, please take the appropriate safety precautions. Many people had previously indicated that they'd love to spray this stuff all over their bathrooms. I sure as hell wouldn't do that in my house.
A week after filming this, I re-tested the treated section of the driveway and found that exhibited absolutely no superhydrophobic properties at all—it had reverted back to regular driveway. The Ultra-Ever Dry site does make mention that the product is somewhat susceptible to UV exposure, but my application method is more likely to blame than anything else. If you plan on applying Ultra-Ever Dry to your sidewalk or walkway, you must be meticulous with the application. Hand sprayers are simply not going to cut it.