Question(s) re deicing fluid

[flapsforty]

Hartington, being a Wagon Dragon I have no idea of the answers to questions 3 and 4, but no doubt some kind soul will answer those for you.
In the mean time, for information on the so-called holdover time, click on any of the links on this page.

For your second question, try here for an example.

And if you really want to delve into the matter, go and have a look at the Deicing Forum
Good luck!