Originally Posted by
spades097
Driving while boarding is impractical because it only lasts for a certain time period once the initial spraying begins. The time it is good for depends on both the outside air temperature and the concentration of the glycol (typically it is 50% water but that can change). Anti-ice might also be required.
On the other hand, it’s nasty, slippery stuff and no one wants to walk or operate equipment around it.
The planes need to be ready to roll right after de-icing or else a second de-icing would be needed, especially in extremely poor weather.
You don't want to be near the fluid that is used to de-ice planes without safety clothing or snug inside an aeroplane with doors closed.