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How to Repair a Porcelain Toilet Tank

Chips, cracks and other types of surface damage severely destroy the look of your porcelain toilet tank. This damage usually doesn't interfere with the integrity of the toilet or keep the toilet from working, but it's a problem nonetheless. Every time you look at the toilet, your eyes are automatically drawn to the damaged areas. Restoring the toilet tank involves filling in the holes and other damaged spots. This gives the toilet a smooth and even look.


  1. Rub the surface of the chipped or otherwise damaged area with 220-grit sandpaper. Roughen up the edges of the porcelain toilet tank slightly with the sandpaper. This gives the filling material a surface that it can stick to quickly and easily.
  2. Pour a small amount of rubbing alcohol on a lint-free cloth. Wipe the cloth around the damaged area, removing any porcelain dust or chips left behind by the sanding. A lint-free cloth reduces the chances of leaving behind any stray fibers.
  3. Fill the chipped or damaged area with filling compound from the porcelain repair kit. Depending on the type of kit used, you'll either have a prefilled plastic syringe or a small tube of compound. If the kit comes with a tube, squeeze a small amount onto a putty knife and rub it across the damaged area. Add enough layers of filling compound that it sits even with the toilet.
  4. Rub the putty knife across the surface of the filling compound, removing any excess compound. Once it's even, let the compound dry overnight. Rub sandpaper across the toilet tank gently, rubbing off any additional compound and creating a smooth surface.
  5. Paint an acrylic-based paint over the dried compound, if you have a colored tank. The filling compound is typically white. If you have a white porcelain toilet tank, use a small paintbrush to paint a small amount of clear glaze over the top, blending the repair into the rest of the toilet.

Things You Will Need

  • 220-grit sandpaper
  • Rubbing alcohol
  • Lint-free cloth
  • Porcelain repair kit
  • Putty knife
  • Acrylic paint (optional)
  • Small paintbrush
  • Clear glaze

Tip

  • For a prefilled syringe, simply remove the cap and twist the tube. Press the end of the tube against the crack or hole and push the bottom of the tube, to fill with the compound.

About the Author

Jennifer Eblin has been a full-time freelance writer since 2006. Her work has appeared on several websites, including Tool Box Tales and Zonder. Eblin received a master's degree in historic preservation from the Savannah College of Art and Design.