MEECO'S RED DEVIL Buff/Tan furnace cement and mortar is a multi-purpose, pre-mixed, cement and fireplace mortar that is ideal for bonding and sealing both masonry and metals. Designed for patching or repairing cracked or chipped firebrick and mortar with working temperatures up to 2000 deg. F. * Effective in re-setting and cementing furnaces, stoves, chimney collars, boilers and duct work Total air cure time of 24 hours, no heat required but ideal cure temperature range of 60 deg. F to 80 deg. F Clean up excess with damp cloth, soap, and water * Can be painted once fully cured Paintable after fully cured