We had mice (possibly rats?) coming out inside the house from that chimney. I am so glad it is now sealed thoroughly. We did not put poison though we might have wanted to. For mice and rats in the walls. But the effect is a clean job right now eshetically speaking about the living room. I am so very glad it is done! Hallelujah! Thank you for your good work, Charlie  Home renovations! It now looks tidier and no more mice inside the living room.Of course, now they are stuck in the walls. And we did not put poison. Maybe upstairs we can slid some mice poison in the walls. The living room is very much nicer now! The paint job is fine and no complaints this time sicne it is a very small surface.