I have a chimny in my garage i've been thinking about putting a wood stove in it. the chimney is a masonary liner with brick around. it runs all the way down to the ground with a cleanout at the bottom. I found one small hairline crack in the liner and it is on the outside wall of the chimney. Only one wall of it is against the building. the other three are on the exterior of the building. my question is should i use this or put aliner down and if so what type. I assume stainless but what brand is suggested if any. Thanks