How to Seamlessly Repair a Crack in a Toilet Tank – A Comprehensive Guide

A cracked toilet tank is not only an eyesore but also a potential source of water leakage, leading to costly repairs and higher water bills. Fortunately, repairing a cracked toilet tank is a relatively simple task that can be completed with a few basic tools and materials. In this comprehensive guide, we will delve into the step-by-step process of fixing a cracked toilet tank, empowering you with the knowledge to tackle this plumbing issue confidently.

4 Common Toilet Problems You Can DIY | PlumbingForce

Identifying the Crack and Assessing the Damage

Prior to initiating any repairs, it is crucial to locate and assess the extent of the crack. Inspect the toilet tank thoroughly, both inside and outside. Utilize a flashlight to illuminate hard-to-reach areas and identify the precise location of the crack. Determine the size and severity of the crack, as this information will influence the choice of repair method.

Choosing the Right Repair Method

There are two primary methods for repairing a cracked toilet tank: epoxy resin or a toilet tank repair kit.

  • Epoxy Resin: Epoxy resin is a durable adhesive that forms a strong bond, making it an effective solution for repairing small hairline cracks on porcelain or ceramic toilet tanks. However, it is essential to note that epoxy resin is not suitable for larger cracks or tanks made of plastic.

  • Toilet Tank Repair Kit: Toilet tank repair kits typically comprise a rubber or plastic gasket and bolts designed to seal around the flush valve opening, preventing water leakage from the crack. This method is more suitable for larger cracks or cracks located near the flush valve base.

Step-by-Step Guide to Repairing a Toilet Tank Crack

Once the appropriate repair method has been selected, follow these step-by-step instructions to restore your toilet tank to optimal functionality.

How do you repair a cracked toilet? -

Materials Required:

  • Epoxy resin or toilet tank repair kit
  • Clean rags or paper towels
  • Sandpaper or a sanding sponge (for epoxy resin only)
  • Screwdriver or wrench (for toilet tank repair kit only)

Instructions for Epoxy Resin Repair:

  1. Clean and Dry the Surface: Thoroughly clean the area around the crack with a clean rag or paper towel to remove any dirt, debris, or residue. Allow the surface to dry completely.

  2. Sand the Surface (Optional): If the crack is on the outside of the tank, lightly sand the surface around the crack with sandpaper or a sanding sponge to create a rough surface for better adhesion.

  3. Apply Epoxy Resin: Mix the epoxy resin according to the manufacturer’s instructions and apply it generously to the crack. Use a toothpick or small brush to work the epoxy into the crack and smooth it out.

  4. Allow to Cure: Let the epoxy resin cure for the recommended time specified by the manufacturer. This can typically take several hours to overnight.

Instructions for Toilet Tank Repair Kit Repair:

  1. Turn Off Water Supply and Flush Toilet: Turn off the water supply to the toilet and flush the toilet to empty the tank.

  2. Remove the Flush Valve: Locate the flush valve at the bottom center of the tank and disconnect it by unscrewing the bolts or nuts holding it in place.

  3. Install the Repair Kit: Place the rubber or plastic gasket from the repair kit over the flush valve opening. Reinstall the flush valve and tighten the bolts or nuts securely.

  4. Turn On Water Supply and Check for Leaks: Turn on the water supply and check for any leaks around the flush valve or the base of the tank. If no leaks occur, the repair is complete.

How To Fix A Crack In A Toilet Tank


A cracked toilet tank can be a nuisance, but it doesn’t have to be a major hassle. By following the detailed instructions outlined in this comprehensive guide, you can successfully repair the crack using either epoxy resin or a toilet tank repair kit, ensuring that your toilet functions optimally and efficiently. Remember to

You May Also Like