Amaco Kiln Cement - 1 Pound Jar, Moist, Ready to Use Mend Fire Bricks Cracks and chips in kiln refractory can be permanently sealed with AMACO Kiln Cement. This prepared cement is ready for immediate use. When mixed with coarse grog or pieces of refractory, cement may be used to repair large holes in firebrick. WARNING: Do not allow direct contact with elements and electrical wiring. Made in USA