This video demonstrates the process of applying the Mainstay Composite Liner system to a deteriorated manhole. The process begins with surface preparation. A 5,000 psi pressure washer is typically used to remove contaminants from the surface and produce a suitable profile. Surfaces must be saturated with water prior to mortar application. Mainstay ML-72 mortar is then mixed and applied either through a shotcrete nozzle or mortar spinner to the surface of the manhole. Mainstay ML-72 mortar can be applied up to 5" in a single pass depending on substrate conditions. Next, the mortar is smoothed using a pool trowel and finished with a sponge to create a somewhat grainy texture suitable for coating application. While the mortar is still in its uncured state, Mainstay DS-5 epoxy coating is mixed and applied using airless spray equipment or a coating spinner to the top of the mortar. 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.
