Monokote® Patching Compound is the only UL approved patching material for patching Monokote® MK-5, MK-6 and MK-10 products that when applied as directed, will maintain the original fire rating of the steel member. It has been developed by GCP Applied Technologies to meet specialty, commercial and industrial fireproofing patching requirements. Monokote® Patching Compound is a mill-mixed plaster, (cementitious) fireproofing material that can be hand mixed and trowel applied as required for patching and repairs to surfaces. Monokote® Patch Compound is hand-applied directly to the steel and/or well-bonded material using standard plastering tools and techniques. It has excellent bonding characteristics; it can be applied up to one inch per pass. Monokote® Patching Compound is classified for use in all UL designs associated with Monokote® MK-5, MK-6 and MK-10 products. References to Monokote® Patching Compound can be found at Database.UL.com by searching for UL File number R4339. Per UL patching guidelines, Monokote® Patching Compound can only be used to patch individual areas of 144 square inches or less. It will provide the same hourly fire resistance of the material being replaced as long as the thickness of the Monokote® Patching Compound is equivalent to or greater than the required thickness of the material being replaced.