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Hey gang, I got a hold of all these refractories for my single burner (3/4" T-burner) propane tank forge that I plan to build. I plan to put the 2600*f kaowool in the inner layer, and the 2300*f stuff on the outer layer. why both types? 2300*f was almost half price. 2sqft of 2600*F kaowool, 2sqft of 2300*F kaowool, one 500ml jar of ready mixed colloidal silica rigidizer, one 55# bag of MIZZOU CASTABLE PLUS, One gallon of premixed zirconium infrared coating (only $20, specifically called "ZK-W WASH") all this totalled to 145$ somehow! (5$ more than i was going to spend on one pint of itc100) I have a few questions. 1.) the zirconium wash's composition is as follows 97.5% ZrSiO4, 0.4% SiO2, 0.1% Al2O3. Is this normal/is any of this toxic cold or when heated/special precautions? 2.) I was told to pour (not trowel) the Mizzou in as thick a layer as possible ("it works better thicker"), up to 4 inches, and that a layer as thin as 1/2" would never work. is this correct? 3.) Should I mix this type of mizzou with Styrofoam to make it more insulating? 4.) is the 500ml jar of rigidizer enough for the propane tank forge? 5.) is there a good way to reduce the forge's internal diameter to the required 350 cu/in? I did the maths and I need to take off 1/2" from the radius. That's alot of questions, I know Thanks in advance