DAP 10.1 oz. Black High Heat Mortar Sealant (12-Pack) 7079818854 - The Home Depot
Amazon.com: DAP 7079818854 High Heat Mortar Fire Stop Caulk, No Size, Black : Industrial & Scientific
Mill-Pac Black High Temp Caulk Sealant - ComfortBilt
Amazon.com: Non-Toxic High Temp Mill-Pac Black Sealant | Fireplaces, Wood, Pellet, and Gas Stoves, Direct Vent Systems, Flue Joints | Environmentally Friendly | 1050-Degree (10.3 oz Cartridge) : Home & Kitchen
Amazon.com: DAP 7079818854 High Heat Mortar Fire Stop Caulk, No Size, Black : Industrial & Scientific