Typically that temperature is 40 degrees F. But, there are plenty of products that will do just fine at lower temperatures. It's also important to note that it isn't air, or ambient temperature, but the surface temperature of the steel itself. There should be no issues unless it was like it was the week after Christmas. If I knew what process they were doing, I could tell you exactly what they would need in terms of environment, time, and containment. But alas, we will have to guess at that until it begins.