I have a Fisher wood stove in good condition and want to install it. It has two hairline cracks on the back that might extend into the stove pipe collar. From what I have read, it should be ok to clean up the surface and put some stove cement over the cracks. Does this seem like a reasonable fix? I had thought of trying to get them welded, but welding cast iron seems to be quite a process. I got it off a friend, and he said he used it like that without any issues, but i am nervous about them, and would like to get them fixed. i only paid $100 for it, so thought it could be worth fixing.