<font color="blue">Whats Tom supposed to do when it freezes? </font>
I'm aware of the temperature considerations, as noted in my previous post. I don't think we yet have enough information yet to know conclusively whether or not it will freeze. The freezing point of the 10% solution would have to be determined - to that end I just put some in my freezer which is at 0 F. Also, we'd have to know the particulars about the "unheated portion of the shop". It might get enough heat from surrounding areas so that it never gets below the freezing point of said 10% solution. An unheated portion of my shop never gets below about 25-30 degrees all winter. The devil is in the details.
And maybe a couple of magnet heaters stuck onto the reservoir, if necessary, would do the trick? Or maybe find out from Lenox if a compatible antifreeze could be added to the diluted Band-Ade? There might be a simple answer once more facts have been determined.