I am considering doing a dome plug as others have done. I do have a question about this. I see that Wade used KS-4, but I have not been able to find that in my area. I noticed that others have used a "repair mortar" to create the plug. What exactly is repair mortar? Is it just something like Refrax or HeatStop with some crushed up firebrick in it or is there a specific repair mortar product that is beign used. I was thinking about going the route of a HeatStop with some firebrick broken into it and wondering if that would tolerate.
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