My shop is at about 63-64 deg. I may have to bring the heat up a bit before installing the ferrule/vault plate, or just bring it in the house when gluing it in. With infloor heat, my shop is quite comfortable at this temp.
That might be the issue I had before, but it was warmer out then, so I couldn't say that was it. I do know that was the first time I used that epoxy and had problems, where I never had issues before when using epoxy. I will say it did eventually hardened up, just took a few days.