Photo the left.
The Channel was first abrasive blasted to sound concrete. Afterwards, a Parge coat of cementitious resurfacing mortar was applied to all of channel walls, restoring the original thickness of concrete. Once the Parge coat had cured, the surface was again abrasive basted, then Primed and coated with 125-150 Mils of Utilithane® 1600 Polyurethane Coating.
Present view is after application of the Utilithane® 1600 Polyurethane Coating and re-installation of the channel hardware.