Just for the record, airplane de-icing fluid is primarily propylene glycol and not the nasty ethylene glycol. The former can be consumed (first, you better check if it is food-grade) and the latter is a nasty poison to cats, dogs and humans. The recommended application temperature is 180 deg F in order to take advantage of the cheap sensible heat at that temperature.

De-icing fluid is not considered hazardous by OSHA, DOT, DOD, NIOSH etc. An MSDS sheet can be viewed at http://www.ascent1.com/anti01.htm

MisterNice