a wee daft question it states that for those in areas where it freezes they must watch that this doesnt freeze the contents of the can is there anything avail to stop this happening or can i just make a wee thermal coat for the wee blighter?
I don't think that statement should worry you unduely as it's really a disclaimer primarily aimed at the North American crowd who suffer weeks of sub zero temps.
This issue first presented itself with the first can version that used steel wool. The wool was situated at the top of the can where the gases/vapours entered via the inlet hose. During winter with prolonged sub zreo temps, the can sometimes never fully thawed out (especially if journeys were short) and the steel wool with frozen condensed water in the mesh became a physical blockage to the gases flowing through the can leading to marked back pressure in the system.
The newer cans don't have this steel wool and the hoses are now routed differently so that the inlet is at the side of the can and not the top. This arrangement greatly minimises any issues with freezing temps.
hth