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How to Repair a RV Holding Tank

RV holding tanks are durable. Sometimes leaks occur due to rough terrain, road debris or freezing. Translucent polyethylene and black ABS plastic are the most common materials used for holding tanks. Before starting any repairs to a holding tank, drill a hole in each end of the crack to prevent it from becoming larger. Drain the holding tank. Perform the repair in a well-ventilated area.

Things You'll Need

  • Disposable gloves
  • Cordless drill
  • Tank draining kit
  • Scissors
  • Acetone or rubbing alcohol
  • Shop rags
  • Cyanoacrylate adhesive
  • Fiberglass cloth
  • Sandpaper
  • Syon Seal-N-Place
  • Small paintbrush
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Instructions

  1. Repairing Translucent Polyethylene Holding Tanks

    • 1

      Clean the damaged area completely using acetone or rubbing alcohol.

    • 2

      Use sandpaper to rough-up the surface of the tank.

    • 3

      Cut a piece of fiberglass cloth that is slightly larger than the damaged area.

    • 4

      Put on gloves. Using the Syon Seal-N-Place kit, break off the tip of the metal tube contained in the resin bag. Keep the bag sealed.

    • 5

      Turn the key at the end of the metal tube to empty the contents into the resin bag. Knead the bag until the resin and contents from the tube are completely mixed. It takes a few seconds to do this.

    • 6

      Brush a layer of resin mixture over the damaged area. Lay the fiberglass cloth over the resin layer.

    • 7

      Cover the fiberglass cloth with a layer of resin. Keep the fiberglass cloth smooth and flare-out the edges with a brush to create a smooth finish.

    Repairing Black ABS Holding Tanks

    • 8

      Clean completely the area around the crack or break. Use acetone or rubbing alcohol to rid the area of road grime.

    • 9

      Cut a piece of fiberglass cloth slightly larger than the area requiring repair.

    • 10

      Put on gloves. Saturate the fiberglass cloth with the cyanoacrylate adhesive. Place the cloth over the damaged area. Smooth out the fiberglass cloth so there are no ridges or bumps. Use a gloved hand for this.

    • 11

      Using a brush, cover the fiberglass cloth with the accelerator that came with the cyanoacrylate adhesive. The accelerator reacts with the adhesive to harden it within a few minutes. Once hardened, the repair is complete.

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