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Even -40C rated stuff will frost over at -10C. It has something to do with wind, but not wind chill. The solution is just that, a solution, aka a mixture of water and methanol (ok, and a dye). There is no chemical bond between these two components. If they remain in solution, I'm sure the -40C rating would be correct. When you spray a thin film onto a windscreen with a lot of air rushing past it, the methanol is going to evaporate much faster than the water. What water is left behind after the methanol evaporates can freeze on the windscreen (and it can also sublimate pretty quickly, luckily). Bottom line, if you have a choice between -20, -30 or -40 rated, get -40 every time, unless the ambient temperature is above 0C (32F), in which case it doesn't matter.
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