Fireplace Maintenance Products Rutland Refractory Cement Pre Mix 64 OZ Buff FCP610Fireplace Replacement Parts & Maintenance Products Buy Rutland Refractory Cement Pre Mix 64 OZ Buff 610 This premixed, easy to trowel, fiber reinforced refractory cement is an ideal high heat sealant for masonry joints 1 4" or less. Use this cement to set, bond, and repair cracked or broken firebricks in stoves, fireplaces, and furnaces as well as for building fireplace boxes. Thick, smooth consistency makes this cement amazing for mortar between