Experience shows that liquid chemical applications are more likely to succeed. Liquid salt, magnesium chloride, calcium chloride, CMA, and potassium acetate are being evaluated. Pre- wetted dry chemicals may also prove effective. Studies during actual storm conditions show that anti-icing produces equal or better road conditions with less chemical use. These liquid chemicals remain on the pavement long enough to work.
Several reports note residual effects for several days.
The fairly light application rates produce a damp surface rather than flooding it. Of course, the pavement temperatures have to be compatible with the effective operating temperatures for the chemical being applied. Problems can develop if heavy precipitation continues and the storm gets ahead of the anti-icing efforts. Heavy rain, freezing rain, or intense snowfall rates can cause a problem. Under these conditions you should switch to a normal de-icing approach to accomplish cleanup.