Hi,
I would not think that it will last very long, I have bare stone behind my woodburner, I remember my parents house had a plastered back to the fire place and it just started to fall off after a few uses of the fire.
I ended up getting some steel cut to the right size and tack welding it in place, then I used some stove polish to make it black, it still looks great now!
here is the flue going in at my place.
