A temp too cold to apply Dicor?

Since heating the garage is not a option, I would heat the interior of the camper for 12 hours before applying and 24 after to warm roof room inside. This will help with bonding by having a warmer roof. I would also set up some heat lamps (Bulb and clamp light about $15) several feet away and keep the area warm for 24 hours to allow leveling and initial bonding. With the heat lamps monitor them when you start to determine amount heating. They are radiant heat so air is not heated much but surface will be. 3 to 6 feet is normally good depending air temp. Remember, trying to warm it, not cook it. They do take a bit of time to warm something so monitoring them every hour until you get them figured out. Have used them on new born livestock for year is cold weather. I hang rhen 6 ft above floor pointed down and it keeps it comfy. Just be careful when you start.