A: Hi there, Per the vendor: Please use the Furnace Cement on cool surfaces. Clean surface to be cemented. Dampen area lightly with water and apply cement. Immediately clean excess cement with warm water to prevent permanent etching. Air dry for at least 1 hour. Within 30 days, Begin by starting and maintaining a kindling, or small fire, and allow it to burn for one hour. After that hour has passed, gradually build the small fire up to a roaring fire (at least 500°F) and maintain the larger fire for an additional hour. The entire process should take approximately 2 ½ hours. If a heat cure is required and is not performed within 21 days of application, the cement or mortar will become brittle, fragile, and chalky. It will eventually lose all adhesion, falling out over time. For step-by-step instructions, check out our how-to video: https://www.youtube.com/watch?v=9kDHsm0YYHk. Cured cement can be removed by sanding or scraping. Heat curing should only be performed once.

A: No, this cement is going to require a heat-cure, which you cannot perform outside of the burn box. The manufacture typically recommend using one of their High Heat RTV Silicone Sealants to adhere stone or tile to the fireplace surround.

A: I had ordered this product. But before I was able to use it on my wood burning stove in my greenhouse, the greenhouse burned to the ground. I had purchased a very similar item in a jar from TSC previously and it worked beautifully. I had no problems all winter. I used it according to directions. Yes, it sealed the cast iron part of the stove to the first pipe. I let it cure, starting off with a light fire. The next time I put the wood to it, getting my stove very hot

A: Yes, Rutland Products Black Furnace Cement can be used to repair hairline cracks in a metal firebox of a wood-burning fireplace. Once heat-cured, it will bond to metal and can be exposed to temperatures up to 2,000-degrees F.

A: This will help seal pipes if a heat cure can be performed. During the heat curing process, moisture is drawn out and fumes will emit. Directly inhaling these fumes is not recommended but this does not require additional ventilation when curing.