Auto body repair & detailing: Fiberglas use, proper material, trouble light

Question
I recently bought a quart can of Cargroom long fiber body filler. How important is the air temperature when using such products? I have no garage and the temperature has been running in the 40's and 50's lately. Is the filler and resin similar to epoxy, creating it's own heat necessary to cure?

Answer
Use a little extra hardner. Filler does warm up when mixed, but it's not so it can cure itself- that will happen anyway. Put a trouble light close to the filler spot, and the heat from the bulb will help it cure faster. You really need temperatures at least 60 degrees for proper material curing and drying for body repair materials. Bill