The DICOR sealant will cure, even if applied at "near freezing temperatures". It will "cure slowly" until the weather warms up, then curing will hasten. Actually, "cure" is probably not the best term to use for what happens as the solvents disperse from the sealant, leaving it to harden and form a "non-sticky consistency"...
Here's what DICOR has to say: "Prior to application, clean the surface of all foreign materials. Allow surface to dry. Use standard caulking equipment to apply Self-leveling Sealant. In cold weather, warm container at room temperature 60° (16°C) – 80° (27°C).
DO NOT USE on vertical surfaces. DO NOT USE as splicing cement. Contains Naphtha."
https://dicorproducts.com/product/ep...manufacturers/ Click on "APPLICATION" to view the above comments.
The reason for warming the container to room temperature is not to "aid curing" but rather to permit the "cold, thick sealant" to "warm and soften" so it will flow from the tube. Once on the roof, the solvents (that keep it semi-liquid) will start to disperse and the sealant will begin to harden. That process (evaporation of the solvent) will be much slower in cold weather, but eventually it will occur, usually as the weather warms and solvent evaporates more quickly.
ADDED: If the trailer is stored outdoors and there will be "less than dry weather conditions" for the next week or so, I'd be reluctant to apply fresh DICOR sealant to unprotected areas. Chances are good that it won't dry sufficiently (evaporate the solvents) before it becomes wet, leaves blow across the sealant surface, dirt/water/grime adhere to the sealant and you wind up with a "big sloppy mess"... If you're trailer is stored indoors, then I wouldn't hesitate to apply the sealant, assuming that temperatures will warm up sufficiently above freezing for extended times in the next week or so.
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