Trenton Keyhole Patch Pad and Tools


The Trenton Keyhole Patch Pad and Tools enable utilities to apply a coating to a pipe surface through a small-diameter hole or keyhole. The components include two tools (attached to extendable poles) and a patch pad with pre-applied coating.

End Use:

The system is an excellent solution for applying a coating within a small-diameter hole over cadwelds or coating holidays.


  • Coating is pre-applied or hand-applied to pads
  • Non-hazardous, no VOCs
  • No waiting for drying or curing
  • Immediate backfill
  • Minimal surface preparation

Operating Procedures:

  • Wire brush and clean the surface of any loose coating, rust, scale and foreign matter.
  • Secure the extension handles (supplied by Trenton or by the utility) to the patch pad applicator and the finishing tool.
  • Attach a pre-coated patch pad to the applicator tool. (Or anticorrosion compound can be applied by hand directly to the bottom of a dry pad.)
  • The applicator tool, with the coated patch pad attached, is then lowered into the keyhole and onto the pipe surface to be protected.
  • Use the finishing tool to hold the patch pad to the pipe while lifting off the applicator tool and leaving the patch pad on the pipe.
  • Use the finishing tool to press the pad firmly to the pipe, making sure that coating compound is squeezed out on all edges and ensuring that the pad is firmly adhered.
  • The patch pad (with coating) now protects the pipe, and backfill can begin immediately.


  • Patch Pad: 4”, 6" or 5"×8" pad
  • Tools: Patch pad applicator and a finishing tool

Color: White
Flash point: 350°F (minimum)
Dielectric strength: 100 volts per mil


The Trenton Keyhole Patch Pad applicator tool has a velcro surface (left) for holding the Patch Pad. The center picture shows the applicator tool with an attached Patch Pad that has pre-applied coating. The finishing tool (right) is used to press the Patch Pad onto the pipe.

Safety Data Sheet
Data Sheet Data Sheet



Northtown Company - 5202 Argosy Ave., Huntington Beach, CA 92649 - Phone: 714-897-0700 - Fax: 714-897-0600