How To Repair a Cracked Toilet Tank

If a toilet tank's ceramic has been completely cracked, then it cannot be repaired.

Temporary measures, such as an epoxy or waterproof adhesive, may help to keep the toilet running for a period of time, but the constant pressure of water combined with user weight will eventually cause the toilet to fail and require a complete repair.

Superficial cracks in a toilet tank, however, can be repaired with a few simple tools. You'll need a grinding bit for a rotary tool, some epoxy, and a free afternoon.

Then you'll be able to follow these steps.


1. Wash the Ceramic Surface.

The crack needs to be completely clean to accept the repair.

Washing it down with some soap and warm water is often enough.

Use a sponge instead of a rag to avoid depositing debris into the crack inadvertently.

2. Drill a Hole Through the Crack.

Locate the end of the crack on the toilet.

Mark it with a marker, pen, or other item.

This is where you'll need to drill a hole using the grinding bit.

Grind a U-shaped channel along the crack so that there is more surface area for the epoxy that will be used.

3. Wash the Surface Again.

You need to remove any debris that you created from your drilling and grinding.

Warm water and soap with a sponge should suffice once again.

4. Fill the Crack with Epoxy.

Using the channel you created along the crack, overfill it so that the epoxy can fill in the gaps that the crack has created.

Use a popsicle stick to move the epoxy through all of the ridges of the crack.

Once completed, cover the epoxy with clear packing tape so it won't drip out of the repair site. Allow the epoxy to dry.

5. Sand the Repair Smooth.

Once the epoxy has dried, remove the tape and sand the surface smooth.

Wipe the area down with acetone, like a nail polish remover, and allow to dry.

Finish the repair with a light coat of refinishing spray to eliminate the aesthetics of the crack.

Make sure you don't use this toilet for 24 hours minimum after the repair.

Then you will have successfully repaired a cracked toilet tank.

Posted on Mar 24, 2015


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