
Flex Seal is a rubber sealant product that can be used to repair leaks in various household items. It is available in spray, liquid, or tape form and can be painted over. Flex Seal has been used successfully in some shower repair projects, but it is not recommended for grout sealer or drip pans. For shower applications, Flex Seal offers Flex Shot, a super-thick rubber sealant that can be used to caulk bathtubs and showers. Flex Shot is easy to apply, comes in multiple colours, and provides a watertight seal. However, it is very noxious and does not offer mould resistance like traditional silicone caulks and sealants.
| Characteristics | Values |
|---|---|
| Effectiveness | Flex Seal can be used to seal showers and tubs. However, it is not suitable for grout sealer. |
| Durability | Flex Seal has a strong track record of lasting longer than standard caulks and sealants with less cracking over time. |
| Ventilation | Flex Seal is very noxious, so proper ventilation is required when using it. |
| Mildew and Mold | Flex Seal only offers a mildewicide and is not equipped to fight mold. |
| Application | Flex Seal is easy to apply and comes in four different colors: white, black, clear, and almond. |
| Surface Compatibility | Flex Seal adheres to metal, asphalt, wood, and masonry and is available in black or white. |
| Waterproofing | Flex Seal creates a thin waterproof rubber membrane to stop surface leaks. |
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What You'll Learn

Flex Seal vs. Flex Shot
While Flex Seal can be used on shower floors and pans, it may not be the best solution for leaks. It is a liquid rubber spray that can be used to cover large surfaces and make them completely waterproof. However, this may require several coats, and it may start peeling within a few weeks.
On the other hand, Flex Shot is a caulking rubber sealant that offers more precision and can be used to fill gaps and cracks in specific areas. It is thicker than Flex Seal and can be built up without the need for a caulking gun. Both products will stop leaks and fill cracks and holes, but the best option depends on the specific application and project requirements.
Flex Shot is a good alternative to silicone sealant for shower floors and bathroom applications as it provides a watertight seal to prevent leaks. It also comes in a variety of shades to match different colour schemes. However, it is very noxious, so proper ventilation is necessary during application. Additionally, Flex Shot does not offer mould resistance, which could be a concern for some spaces.
In summary, for broad coverage and making a surface completely waterproof, Flex Seal is a suitable option. For more precision and filling gaps in specific areas, Flex Shot is the preferred choice. It is important to consider the pros and cons of each product and decide based on the specific requirements of the project.
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Flex Seal vs. Silicone Sealant
While Flex Seal products can be used to seal showers and tubs, it is important to note that they are not a substitute for caulk or silicone sealants. Flex Seal is a rubber sealant that can be used to create a waterproof membrane and stop surface leaks. On the other hand, silicone sealants are typically used in bathrooms and include mould- and mildew-resistant chemicals in their formula.
Flex Seal products, such as Flex Shot, can be used as an alternative to silicone sealants for shower floors and other bathroom applications. Flex Shot is a silicone-based rubber sealant that provides a watertight seal to prevent leaks and is available in various shades to match your bathroom's colour scheme. However, it only offers mildewicide and is not equipped to fight mould, which could be a concern. Additionally, Flex Shot is very noxious, so proper ventilation is necessary during application.
One advantage of Flex Shot over traditional silicone caulks and sealants is its ease of use. It offers products with built-in applicators, whereas caulk and silicone sealants typically require a caulk gun. Flex Shot also has a strong track record of lasting longer than standard caulks and sealants, with less cracking over time.
When deciding between Flex Seal and silicone sealant, it is important to consider the specific needs of your project. Both options are reliable and suitable for shower and bathroom applications, but each has its own set of benefits and drawbacks. For example, while Flex Seal may offer a quick and easy solution for sealing or repairing a crack in your shower floor, silicone sealant provides mould and mildew resistance, which is crucial in maintaining the integrity of your bathroom surfaces over time.
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Flex Seal vs. Rubber Flexx
While Flex Seal can be used to seal showers and tubs, it is not the best solution for a leaky shower floor. Flex Seal is a rubber sealant that can be used to fix leaks in various household items, including toolboxes, ductwork, and boats. However, it has been noted that Flex Seal can start to peel and leak over time, especially when exposed to extreme temperatures and sunlight.
Rubber Flexx is a similar product to Flex Seal, offering a waterproof membrane to stop surface leaks. However, it has less surface compatibility and is only available as a liquid or tape, adhering to metal, asphalt, wood, and masonry. Rubber Flexx is not suitable for use on shower floors as it is not available in caulk form and is not a substitute for caulk or silicone sealant.
Flex Seal offers a range of products, including Flex Shot, which can be used as an alternative to silicone sealant for shower floors. Flex Shot provides a water-tight seal to prevent leaks and is available in various shades to match different colour schemes. However, it only offers mildew protection and is very noxious, requiring proper ventilation during application.
When deciding between Flex Seal and Rubber Flexx for a shower pan, it is important to consider the specific project requirements and surface compatibility. While Flex Seal may be a suitable option for sealing a shower pan, it is essential to follow the manufacturer's instructions and ensure proper ventilation during application. It is also crucial to address the root cause of the leak and ensure that the shower pan is properly installed and waterproofed before applying any sealant.
In conclusion, both Flex Seal and Rubber Flexx have their advantages and disadvantages. Flex Seal offers a wider range of products, including those suitable for shower applications, while Rubber Flexx has limited surface compatibility and is not suitable for use on shower floors. It is important to weigh the pros and cons of each product and consider the specific project requirements before making a decision.
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Pros and Cons of Flex Seal
Flex Seal is a product that can be used to seal leaks. It is available in liquid, paste, or spray form, and it can be painted over. It is also possible to use Flex Seal products on shower floors and tubs to seal cracks and prevent leaks. However, it is important to note that Flex Seal is not a substitute for caulk or silicone sealant. Here are some pros and cons of using Flex Seal:
Pros
- Flex Seal can be used to seal leaks in various applications, including gutters, drip pans, and boats.
- It can be used as an alternative to silicone sealant in showers and tubs, providing a water-tight seal.
- Flex Seal is flexible and can coat, seal, and protect almost anything, as per the manufacturer.
- It has a strong track record of lasting longer than standard caulks and sealants, with less cracking over time.
- Flex Seal is easy to use and comes with built-in applicators, unlike caulk and silicone sealants, which typically require a caulk gun.
- It can be painted over with most interior and exterior paints and holds colour very well.
Cons
- Flex Seal may not be effective for larger holes or leaks, as it may drip or blow out under water pressure.
- It can tear when bent too far.
- Flex Seal is very noxious, and proper ventilation is required when using it.
- It does not offer mould resistance, which could be a concern for some applications.
- The product starts to set once the container is opened, so it must be used all at once to avoid waste.
- There have been mixed reviews of the product, with some customers reporting issues with its effectiveness, customer service, and difficulty removing it.
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Flex Seal for Shower Grout
Flex Seal and its associated products can be used to seal showers and tubs. However, it is not recommended for use as grout sealer. A licensed architect advises against using it for this purpose, as it is like liquid rubber in a can and is not as effective as a real grout sealer.
Grout in a shower is not meant to keep water out. It is porous and merely water-resistant. Underneath the tile in a shower is a pan with a rubber membrane that is the waterproof portion. The tile is on top of that, serving as an extra layer of protection.
If you are looking to seal your shower grout, it is best to fill in any holes with matching grout and then seal the grout with a grout sealer, which can be found at your local home improvement store.
If you are looking to seal your shower floor or bathtub, Flex Shot is a product that can be used as an alternative to silicone sealant. It provides a water-tight seal to prevent leaks and comes in a variety of shades to match your bathroom's colour scheme. It is easy to apply, as it comes in an easy-to-use, built-in applicator, and does not require a caulking gun. However, it is very noxious, so proper ventilation is a must when using it. Additionally, it only offers mildewicide and is not equipped to fight mold, which could be a concern.
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Frequently asked questions
It is not recommended to use Flex Seal on a shower pan. While it can be used to seal showers and tubs, it is not as effective as other methods and may not provide a long-lasting solution.
One alternative is to use a grout sealer, which can be purchased at a local home improvement store. Another option is to use a product called Flex Shot, which is a super thick rubber sealant that can be used to caulk showers and bathtubs.
Flex Shot is easy to apply and comes in four different colors, so it can match any bathroom color scheme. It also has a strong track record of lasting longer than standard caulks and sealants with less cracking over time.
Yes, Flex Shot is very noxious, so proper ventilation is necessary when using it. It also does not offer mold resistance, which could become a concern in a moist environment like a shower.
Simply push the nozzle to apply a bead of Flex Shot to the desired areas, then use your index finger to smooth it out and ensure it fills every gap, crack, and hole. Wipe away any excess product and allow 48 to 72 hours for it to cure completely.










































