I have some small eroding borders where both my fireplace chimney and Wood/Coal stove Chimney (early 90's Consolidated Dutchwest Federal Airtight, Large) meet the fireplace or beginning of the stove flue. I wanted to patch this with stove cement and found some Imperial Hi-Temp Stove and Furnace Cement. There is a brief and ambiguous instruction: "Must be heat cured". I called the company and the receptionist responded directly by saying, heat the stove up to 200 degrees, let it die, heat it up to 300 degrees, and let that die, and then you can fire the stove up". Does this eem right? Also, I can measure the flue of the stove but I don't know how I will calibrate or measure my fireplace chimney heat. Thoughts and suggestions?