Bought at the end of the warm season. I laid outdoor tiles. The weather during the night and for the next few days was supposed to be below 40 degrees, which was the lower limit for the curing temperature of the joint compound I used. I wore this for a few days. It worked very well. It is heavy enough not to be blown away by normal wind. I checked the substrate temperature while he was there and it was pretty close to the advertised 100 degrees. Well made and durable.