To vent my bathroom exhausts I'll have to install a couple vent hoods in my roof, which means cutting holes in my roof and sealing the vents in place with roof cement. I bought the kind you see pictured. On the tube it says how long the cement takes to dry at 70˚ (24 hrs) but doesn't say anything about whether the stuff even works in 47˚, which is the average temperature here over the next few days. Or if it does work, how long it takes to dry. Anyone here know? If it doesn't work unless it's warm out, is there another product that works in the cold? Or do I have to put this project off until spring?