How to Fix Crack Toilet Tank – Step-by-Step Troubleshooting

Toilet tanks are built to oppose water in your bathroom. But a cracked toilet tank can bring chaos into your household in no time. When it comes to fixing toilet facilities, it might seem best to seek help from a professional plumber. But How to Fix Crack Toilet Tank?

However, with the right guide, it is also possible to fix such problems just by sitting at home. If you wake up to a leaking toilet and notice cracks in your toilet tank, do not rush out of the house to buy a new one. 

Replacing a toilet tank is costlier and also a difficult process. You can always try to identify the issue. Then, start its fixing procedure with the right help. Today we will provide you with easy solutions on how to fix a crack toilet tank.


Materials You Will Need to Fix a Cracked Toilet Tank-

If you do not want to go through extra hassle while fixing a running toilet, it’s clever to gather all the necessary materials before starting the fixing procedure. Here is a list of all the things you need to gather beforehand before starting the repairing process: 

  1. Water-resistant Plumbing Epoxy
  2.  Plumbers Putty (Alternative)
  3. Silicone Porcelain Sealant (Alternative)
  4. Putty Knife
  5. Caulking Gun (Non-mandatory)
  6. Electric Hair Dryer (Non-mandatory)
  7. Sandpaper
  8. Chamois Cloths/Towels/Sponges

Easy, Step-By-Step Methods to Fix Cracked Toilet Tank-

If you’re worried about fixing a leaking toilet tank without the assistance of any plumber or professional, now it’s time to stop worrying. 

With the help of our easiest yet most effective step-by-step methods, you will be able to fix any toilet facilities in no time.

So, without wasting any time, collect your necessary items, and let’s start the fixing process!

Step 1: Turn off the water supply

Firstly, turn off the water supply. Water leakage is a huge problem when a toilet tank gets cracked. If your toilet tank starts to leak water, you should immediately fix it without any delay. Sometimes, cracked toilet tanks don’t leak water; in that case, you can skip this step.

Step 2: Dry the inside and outside of the tank

Now, to apply sealer on the cracked areas of your toilet tank, you need to dry the tank both inside and outside. If the toilet bowl stays wet, then the sealer won’t work, and the process will go in vain. Use chamois cloths or towels, or sponges to dry the tank. Sometimes, using an electric hair dryer also helps to dry the tank out completely.

Step 3: Apply waterproof sealer

When applying a sealer on the cracked areas of your toilet tank, make sure the sealer is waterproof. You can use the waterproof plumbing epoxy or the silicone porcelain sealant that is available. A waterproof sealer will protect your toilet tank from getting cracks in the future.

Step 4: Spread the sealer out on the whole surface

After applying the sealer on cracked surfaces, spread out the sealer on the other surfaces with a putty knife. This will protect the whole surface from getting any cracks. It will also make the sealer symmetrical on your cracked toilet tank.

Step 5: Wait for the sealer to dry completely

Now, wait for at least 24 hours to let the sealer dry out completely. If the silicone/epoxy sealer doesn’t dry off completely, then the cracked areas won’t get fixed. As a result, if you turn on the water, it may start leaking.

Step 6: Turn on the water supply

Once your waterproof sealer gets dry completely, you can turn on the water supply and check the cracked areas. If the water is still leaking from the tank, then turn off the water supply and check the cracked spots thoroughly. 

How to Protect Toilet Tanks from Getting Cracked: Causes and Remedies

Replacing or repairing a cracked toilet tank every month will take a heavy toll on your physical and mental well-being. Most of the time, such problems with toilet facilities bring a disaster to a household. 

Here, we have shortlisted some easy preventions that can protect your toilet tank from getting one or more cracks.

  1. Sometimes, the water pressure can cause a toilet tank to crack. If the tank has to withstand high water pressure than usual, then it may get one or more cracks on its surface. In that case, always check the water supply and keep its pressure minimal.
  1. If you’ve been using the same toilet tank for years and repairing it over and over again, then it’s time for you to replace it with a new one. Toilet tanks get cracked easily because of their heavy use. When you use a repaired toilet tank for a long time, it has a high chance of getting cracks.
  1. If you want to prevent your toilet tank from getting cracks, make sure to check its sealant. If you have the waterproof silicone porcelain sealant, then your toilet tank is suitable for heavy use. Otherwise, non-waterproof cheap sealant without porcelain can’t be used for many years.
  1. Most of the time, toilet tanks get cracked because of accidents. So, avoid placing any heavy object on top of the toilet tank. Sometimes, toilet tanks get cracked for upholding heavy materials on their tops. Although in emergency situations, you can put some light stuff on its top such as tissue rolls, a cleaning brush, etc.
  1. Sometimes, cracks in toilet tanks also appear when someone puts the toilet tank lid onto the tank. Toilet tank lids are very heavy, while the other hand, toilet tanks are very fragile. You need to place the lid carefully in order to avoid any damage.


Toilet facilities play a very important role in our daily lives. Difficulties with such facilities bring a heavy toll on us.

With the help of this article, now you know how to fix a cracked toilet tank effortlessly in no time! You can also protect your tank from further damages with all the information this article has provided. 

Frequently Asked Questions

How can I repair a crack in a toilet tank?

Answer: You can repair a cracked toilet tank by applying sealer on the cracked spots. If you’re repairing your cracked toilet tank all by yourself, make sure to collect a waterproof sealant.

Can I use any flex seal to fix a cracked toilet tank?

Answer: Yes, you can use flex sealer to fix the cracks on your toilet tank. If you want to use any flex seal, then make sure to use the waterproof one to protect your tank from leaking.

Is it normal to have cracks on your toilet tank?

Answer: Usually, cracks on toilet tanks can cause water leakage and many other problems. If you notice one or more cracks in your toilet tank, then get ready to fix such issues as soon as possible.

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