Mainstay ML-72 is a blend of portland cement, microsilica, thermoplastic fiber, densifiers, admixtures, and other modifiers that produces a high strength, low shrinkage, and low permeability mortar for the rehabilitation of deteriorated concrete structures such as manholes, lift stations, wet wells, etc. Mainstay ML-72 mortar can withstand environments with a pH of 3 or higher, but is typically used in conjunction with a corrosion barrier topcoat, such as Mainstay DS-5 100% Solids Epoxy Coating.

Mainstay ML-72 product data PDF Download our product detail sheet (35 KB, opens in separate window).

Product Overview

Mortar Type

Portland cement and natural siliceous aggregates enhanced with microsilica, polypropylene fibers, and various additives


65 pound bag; special packaging available

Mix Water

Up to 1.3 gallons per bag


0.54 cubic feet per bag when mixed correctly

Compressive Strength

10,000 pounds per square inch in 28 days (ASTM C-109)


0% after 28 days at 90% relative humidity (ASTM C-490)

Application Equipment

Contact us for information regarding the proper equipment to apply this product.