toilet leak sealant

What Can You Use To Seal A Leaking Toilet?

Imagine having to deal with a wet bathroom floor and the increased water bill resulting from a leaky toilet. While a toilet leak isn’t entirely an urgent problem, it can be pretty annoying and should be solved, and fortunately, you can easily solve it with a high-quality toilet leak sealant.

However, finding the best leak sealant isn’t so easy, considering the market offers numerous choices. Nonetheless, it’s essential to find the best sealant to ensure your toilet is watertight.

Remember that there are many low-quality knock-offs when selecting a toilet leak sealant. To help make your work easier and make an informed decision, I’ve researched and compiled the best toilet leak sealants.

5 Best Toilet Leak Sealant

You can use the following toilet leak sealants to stop water from leaking from your toilet.

J-B Weld 8277 WaterWeld Epoxy Putty Stick – 2 oz.

This product is made to withstand up to 176 °C (350 °F) intermittent temperature and 149 °C (300 °F) continuously. In addition, it is resistant to chemicals like hydraulic fluids, and petroleum, among others, when wholly cured and has 1300 PSI lap shear strength.

J-B Weld 8277 WaterWeld Epoxy Putty Stick is compatible with multiple materials, including porcelain, plastic, ceramic, marble, rubber, and concrete. You can also use it to seal carbon fiber, brick, bronze, aluminum, stainless steel, iron, copper, PVC, and brass.

You can conduct a DIY project to fix a leak with this sealant, whether small or big. The best part is it’s designed to repair and restore leaking objects at the first application and deliver quality results and superior performance. 

Moreover, J-B Weld 8277 WaterWeld Epoxy Putty Stick can cure and set underwater, is NSF certified, and safe to touch potable water. After curing, you can drill, sand, paint, tap, and file. 

The set time for this sealant is 15 to 25 minutes, and it takes an hour to hard set.


  • Easy to use
  • Versatile
  • Chemical resistant


  • Must be applied correctly to work.

Flex Seal Liquid Rubber in a Can, 32-oz, Clear

Flex Seal Liquid Rubber is an excellent choice if you are looking to seal leaks regardless of how tough they are. It gets into holes and cracks, is flexible, provides a watertight seal, and offers a rubberized coating.

Additionally, it’s highly durable, lasting for years, pliable, and flexible. Flex Seal Liquid Rubber is suitable for stopping leaks in various surfaces, including your toilet and bathroom, to form a flexible, watertight rubberized coating.

You can pour, dip, roll, or brush this super thick coating but ensure you read and follow the instructions provided by the manufacturer during application. This product is UV-resistant, covers fast, provides a smooth seal, and seals out moisture, air, and water.

In addition, it’s chemical and mildew resistant and prevents corrosion and rust. You can get it in gray, clear, white, and black.


  • It’s easy to use and spread
  • Adhesive
  • Stops leaks swiftly
  • Creates a watertight seal


  • It can spread thick 

Gorilla Waterproof Caulk & Seal 100% Silicone Sealant, 10oz Cartridge, Clear (Pack of 1)

This is an adhesive and sealer you can use on any surface so you can keep Gorilla Waterproof sealant in your home, trunk, or boat. Upon application, this product dries clear, thus giving you are clear and clean repair.

Moreover, it’s made to provide a solid bond to make your toilet airtight, preventing it from leaking anymore hence helping you keep a dry, clean bathroom. It is perfectly adequate for interior and exterior materials and any weather, making it a precious product for your home.

You will get a waterproofing caulking from a Gorilla sealant, keeping out moisture, air, and water. In addition, it doesn’t crack, shrink, or turn yellow.

It’s also worth knowing that the surface can be exposed to water 30n minutes after applying Gorrila sealant. Moreover, avoid getting burnt by putting on protective gear when handling this sealant.

You can buy it in a single pack, a pack of 6 or 12, and it’s available in white or clear colors. 


  • Useful on various surfaces
  • Dries clear
  • It’s waterproof
  • Resistant to mold and mildew


  • It creates a big mess if it spills

UniBond Anti-Mould White, Waterproof Mould Protection Kitchen & Bathroom Sealant

This sealant is specifically formulated for humid and warm environments, so you can use it to seal leaks in your kitchen, toilet, and bathroom, among other tiled surfaces or areas. It provides a strong, waterproof seal that is resistant to mold once it dries.

Furthermore, J-B Weld 31310 is highly adhesive, strong, and durable; hence you can create a long-lasting and perfect seal. To achieve a finish free of mold, you should regularly clean the sealant.

Once you apply this sealant to an object or surface using a gun, give it 20 minutes to touch dry and 24 hours to fully dry. It’s available in different color names- antimould white cartridge, sealant including smoother tool, antimould translucent cartridge, and antimould ivory cartridge.

You also have multiple pattern name choices. These are mold protection, + sealant remover, + sealant finishing tool, + silicone sealant remover, and + sealant remover smoother. 


  • Easy to use
  • Highly adhesive
  • Mould resistant
  • Creates a flexible seal
  • The cartridge is user-friendly and provides precise application


  • It has sensitizing substances that can cause allergic reactions
  • Harmful to aquatic life

Henkel 908570 2.7 oz Tub Clear Silicone Waterproof Sealant, Single Tube

This multipurpose sealant and adhesive is suitable for porcelain, tile, glass, rubber, granite, ABS, some rubbers, aluminum, and metal. It is recommended for bonding fiberglass, stainless steel, wood, cultured marble, plastics, and vinyl tile.

You can use it to create a protective, waterproof seal on your toilet and other areas. In addition, it’s also effective for repairing or bonding freshwater and saltwater aquariums. 

You can use it outdoors and indoors to repair just about anything, including electricals connections. Henkel 908570 is made to be flexible, impact-resistant, multipurpose use, waterproof, ideal for gap filling, resistant to extreme temperatures between 140°F (60°C) and -35°F (-37°C).

However, you can’t use it on polypropylene, polyethylene, polytetrafluoroethylene (PTFE), polycarbonate or PVC, and polymethylmethacrylate (PMMA). It’s also not paintable or suitable for cement, marble, brass, limestone, magnesium, concrete, zinc or galvanized metals, copper, or iron.

In addition, Henkel 908570 doesn’t crack, shrink, or peel.


  • Easy to use
  • Water-resistant
  • Adhesive and waterproof
  • Aquarium safe
  • Highly versatile


  • Not paintable
  • It doesn’t work for every surface or material

Read also Toilet leaking from base after replacing wax ring

How To Pick The Best Toilet Leak Sealants

Below is what you must consider when choosing a leak sealant for your toilet.

  1. Design

Don’t disregard the color scheme, material, and even weight of the products you are considering buying. This will help narrow down the choices and land on a sealant that matches your demands and tastes. 

  1. Specifications

The sealant must be equipped with the necessary features to achieve the proper repair or bonding job. The primary factors worth considering are affordability, performance, and features.

For instance, you should pick a waterproof sealant considering that toilets come into contact with water and are situated in the bathroom, which tends to be wet.

  1. Branding

While branding doesn’t always guarantee the quality, some brands are renowned for manufacturing superior products. Therefore, you should do your research to find such brands.

An excellent brand makes its products with precision and care, correct any flaws, answers customer questions, and refund or exchange damaged products.

Read also Why is there urine around base of toilet

  1. Cost

Don’t buy a toilet leak sealant you cannot afford, but don’t buy a knock-off either in an attempt to save money. Weigh in the performance, quality, and cost, and remember that just because something is expensive doesn’t mean it’s the best. 

      5. Durability

Nobody wants to be doing repairs constantly, so you must do a sealant that offers many years of services upon application. The durability of a toilet leak sealant depends on how it’s built and designed and the user following the manufacturer’s instructions.

Make sure the sealant can tolerate high temperatures, pressure, damage, and wear. 

  1. Customer Reviews

The experience other consumers have had with a product will help you arrive at an informed decision. Reading through customer reviews helps you have an idea of what to expect from a particular sealant.

Read also White or clear caulk around toilet


The bottom line is that we all want to get the best from our purchases, which means a toilet leak sealant that will stop leaks and restore your toilet’s functionality. You can choose any of the above products but also do your due diligence. 

Read also Extra thick wax ring vs regular?

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