The Mainstay® Composite Liner is a manhole rehabilitation system consisting of a high strength restoration mortar (typically Mainstay ML-72) and an epoxy corrosion barrier coating (typically Mainstay DS-5) that cure simultaneously to repair and protect brick and concrete manholes, lift stations, wet wells, and other sanitary sewer structures. The mortar is first shot onto a new or deteriorated substrate, and an epoxy topcoat is then immediately applied while the mortar is still soft. The concurrent application of these materials creates a monolithic surface that cures into a strong, highly corrosion resistant, and continuous manhole lining, free of pinholes, holidays, and voids. The mortar and topcoat are tightly bonded not only to the substrate but also to each other.

Bird's eye view of a deteriorated brick manhole before rehabilitationBird's eye view of manhole lined with the Mainstay Composite Liner

Product Detail Sheets:

Ancillary Manhole Rehabilitation Products:

Water flows through openings of clarifier lined with Mainstay Composite LinerRecommended For:

  • Manhole rehabilitation
  • Lift station restoration
  • Wet well repair
  • Wastewater treatment plant headworks
  • Clarifiers
  • Digesters
  • Sumps
  • Sewer pipe
  • Trenches
  • Paper mills
  • Chemical processing plants

Advantages of the Mainstay Composite Liner:

  • Sample of the Mainstay Composite Liner with ML-72 mortar on the bottom and DS-5 epoxy on topThere is no wait time for the mortar to cure after it is applied to the manhole because the epoxy topcoat is applied while the mortar is still soft.
  • This system is specifically designed for use in moisture laden environments. Restoration mortars used in the Mainstay Composite Liner are properly applied when the surface of the concrete or brick manhole remains damp.
  • Mainstay ML-72 mortar is a high-build restoration mortar that can be applied to vertical manhole surfaces up to 5" thick, often restoring the manhole substrate to its original thickness.
  • Mainstay DS-5 is a 100% solids epoxy coating. It contains no solvent and may be applied to the manhole up to 125 mils in a single coat.