I have read many interesting threads here in the past and decided to join today. Has anyone used super firetemp x for a fire box on a diy project. I believe it's the same product used for firemen practice buildings to protect the structure. Any feedback would be welcome. I am thinking about building a water boiler this spring. I have built a gasifier in the past and it worked well. I will be moving and decided to build another (non gaser, not worried about smoke anymore and easier to build) using concrete block then ceramic blanket then super firetemp x against the flame. The water tank will set on top of the structure.