How to Repair Your RV's Freshwater Tank


Repairing an RV water tank involves patching the crack or hole. If the crack or hole is too big to patch, the water tank must be replaced.

Things You'll Need

  • Small Disposable Brushes
  • Rubber Gloves
  • Epoxy Resins
  • Fiberglass Patches
  • Drain the freshwater tank.

  • Remove the tank if the area that needs to be repaired is hard to reach.

  • Drill two small holes, one at either end of the crack you want to repair.

  • Sand the area around the crack to create a rough surface to which the patch can easily stick.

  • Cut a fiberglass patch bigger than the crack by one or two inches in all directions.

  • Mix the epoxy resin with its catalyst.

  • Apply the patch to the sanded, resin-covered area.

  • Lay the patch over the resin.

  • Cover the patch completely in the resin with a small brush.

  • Let the water tank sit for 24 hours before refilling it and checking for leaks.

Tips & Warnings

  • Wear a mask to protect yourself from fumes.
  • If the crack or hole is in a hard-to-reach area, you may have to remove the tank and then reinstall it when you're done.
  • You have only 20 minutes in which to apply the resin. After that it starts to harden and becomes impossible to work with.
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