Mark Mandell - Gone Round In New Jersey
Often used that way. Black silicone is the go-to adhesive for fireplace "guys" to stick items to fire brick where they won't get hit by direct flames. The stuff can take quite high heat. I used to fuss with fire clay to seal the rim of our fireplace door unit. It kept cracking and crumbling each year. Chimney guy told me about the silicone trick. It's been 15+ years and still in good shape.