I picked up a second heat treat oven, this one is a lil bigger than my current

I picked up a second heat treat oven, this one is a lil bigger than my current

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oven, but i got cheap, due to the fact that it needs to be re- refractoried. the heating coils are all intact. (checked em ) just during a move, i guess the refractory cracked out. Many many moon ago, i used to retube/remud boilers.BUT, what is the best way for me to do this, a pour-able refractory mix? been a long time since ive done this, and i don't want to screw it up. this oven will move me up. whose done this before?

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I picked up a second heat treat oven, this one is a lil bigger than my current