How to fix a crack toilet tank in just 3 ways with a guide

A simple hairline crack in the toilet tank may seep the water out and cause a big mess in the bathroom. Toilet tank crack is not always visible.

While it may be difficult, repairing a hairline fracture in a toilet tank is relatively simple.

Today, I’ll walk you through the steps to take you to how to fix a cracked toilet tank. This guide will show you how to properly seal the crack and get your toilet back up and running.

Follow these simple steps that I applied to my American Standard toilet tank crack and stop the leak. So, no worry- Your toilet can be as good as new in no time!

But I’ll encourage you to know the causes of toilet tank crack.

What would cause the toilet tank to crack?

A few different things could potentially cause the toilet tank to crack.

Cause1. Water Pressure can cause a hairline crack in a toilet tank.

Amongst the most prevalent causes is an overfilled tank, which puts too much pressure on the tank and causes it to crack.

Cause2. Thermal expansion can cause a toilet to crack.

Thermal expansion is when the water in the tank expands in response to changes in temperature. If the tank cannot expand, it can cause the tank to crack.

Cause3. Manufactural Defect 

Any structural damage to the tank could potentially result in a crack.

4. Other Reasons for Toilet tank lead to crack

· If your toilet gets too old and the porcelain materials become damaged over time. By water pressure, too much used, etc.

· If any heavy object falls over the tank, it may lead to a crack.

·   Cleaning process: Sometimes harsh chemical cleaning or harsh cleaning process lead to cracking toilet tank.

Read More- How to raise the water level in the toilet tank

can a crack in a toilet tank be repaired

Can a crack in a toilet tank be repaired?

Yes, a crack in a toilet tank can be repaired. However, the repair may not be permanent if the crack is large. If the crack is tiny enough, it may be possible to fix it with epoxy, sealant, or adhesive.

If the crack is big, the tank must be replaced. To do this, 

1. Turn off the toilet’s water source and flush it to empty the tank.

2. Disconnect the tank’s water supply line and the tank’s connection to the bowl.

3. Take the tank to a hardware store or plumbing supply store and purchase a new one.

Note- Before going to repair or fix, make sure to shut off the water supply and flush the toilet. Dry out the tank by sponging or old clothes. This can give you the best result and repair fast.

How to fix a crack toilet tank?

Repairing a crack in a toilet tank is a relatively easy task and can be done in just a few minutes. However, it is essential to fix the crack as soon as possible, as it can lead to water leakage and damage to the toilet. 

There are various easy ways to repair cracked porcelain toilet tanks.

Option1. Fix a hairline crack in the toilet tank using Waterproof epoxy

If you have a hairline crack in your toilet tank, do not worry! 

You can easily fix it using waterproof epoxy. Here is how to do it:

1. Clean the area around the crack with a damp cloth.

2. Apply a thin coat of epoxy to the crack.

3. Let the epoxy dry for 24 hours.

4. Apply a second coat of epoxy to the crack.

5. Let the epoxy dry for 24 hours.

6. Test the toilet to make sure it is working correctly.

If you follow these instructions, your toilet tank will be fixed soon!

Waterproof epoxy is a kind of epoxy specifically designed to be waterproof. This type of epoxy can be used for various applications, including bonding and sealing. It is also suitable for usage in water or moisture situations.

There are a variety of different waterproof epoxies available on the market. Some are designed for general use, while others are specifically designed for certain applications. It is crucial to choose the right type of waterproof epoxy for your needs.

A waterproof epoxy is an excellent option for many different applications. It is durable, reliable, and long-lasting. It can be used to connect and seal surfaces in contact with water or moisture. It is also an ideal option for marine applications.

· Henkel Clear Waterproof Silicone Epoxy 

· Gorilla Two-part, 5 Minutes seal Waterproof Epoxy for toilet tank

· J-B Weld ClearWeld – best epoxy for toilet tank repair

Option2. Fix a crack in your toilet tank by Using Silicone Caulk

Silicone caulk is a common sealant that can be used for this purpose, and it is available at most hardware stores.

If you have a crack in your toilet tank, you can fix it yourself using silicone caulk. Here’s how:

1. Clean the area around the crack with a damp cloth.

2. Cut a piece of silicone caulk that is slightly larger than the crack.

3. Apply the silicone caulk to the crack and smooth it out with your finger.

4. Let the silicone caulk dry for 24 hours.

5. Flush the toilet to ensure that the crack is sealed up.

Silicone caulks are among the most widely used caulks on the market. They are well-known for their remarkable stickiness and flexibility, making them suitable for a wide range of applications.

Silicone caulks also resist mildew and moisture damage, making them excellent for bathrooms and kitchens. 

Some brands of silicone caulk also contain fungicides, which help prevent the growth of mold and mildew. 

Silicone caulks come in various colors, making them an excellent choice for repaired or renovated areas where the surrounding surfaces must be matched.

Best Silicone Caulk for repairing toilet tank:

· Gorilla White 100% Silicone Sealant Caulk, waterproof

If your toilet tank has a major crack, you may need to replace it entirely.

Option3. Flex Seal for Toilet Tank Crack

If you have a crack in your toilet tank, Flex Seal can help you fix it. Flex Seal is a rubberized sealant that will create a watertight seal, so you won’t worry about any more leaks. Simply apply the sealant to the crack and allow it to dry.

Wrap Up On Fix A Crack Toilet Tank

Now that you understand how to fix a crack toilet tank, the next time it happens, you can take care of it yourself and avoid having to call a plumber.

All in all, fixing a cracked toilet tank is not as difficult as it may seem. With the right tools and a little patience, you should be able to do it yourself with no problem.

Have you tried repairing your own toilet tank? If so, please share your experience in the comments section below!

Read More– Are toilet tanks universal?


Q1. How much does it cost to replace a toilet tank?

The cost to replace a toilet tank will vary depending on the brand and model of the tank, as well as the complexity of the installation. 
Generally, you can expect to pay between $100 and $300 for a new tank.

If you are installing it yourself, you will need to purchase the tank and a new toilet seat and lid. If you are hiring a professional, the cost of installation will be added to the price of the tank.

Q2. Can I buy just a toilet tank instead of fixing the cracked toilet tank?

If the crack is only in the tank and not the bowl, you can probably buy just a tank. However, if the crack is in the bowl, you will have to buy a new toilet.

Q3. Can you glue a toilet tank lid back together?

The quick answer is YES; you can reattach a toilet tank lid using glue.
However, whether or not the lid will stay glued together over time! It is not recommended to glue a toilet tank lid back together because the sealant can break down over time, and the lid could come loose.
If you choose to glue the lid back together, use a high-quality sealant made explicitly for this purpose.

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