Hi,
I'm looking to use casting resin in a project which (when cured) will be exposed to nordic winter temperatures (around -20oC and below). I have heard that some casting resins will become brittle at low temperatures. Could you tell me which would be the best one for these conditions? 

For info: The volume of resin to be casted is to fill a wooden trench approximately 25mm wide, 10mm deep and 1600mm long.

Thanks very much