Under the boiling point of water for the most part. The stuff does hold a lot of heat so you don't want to get it on you as it will burn. You do want it in the "molassas in January" type of pouring ability. The reason for this is that you do want about 1/4"-3/8" thickness of the lap when you're done. When you get to the thin pouring, you have to wait for the lap to cool enough to be able to start processing it.