The Best Bathroom Sealant 2022

Bathroom sealants offer protection from water entry in high humidity or wet areas and they can be used upon showers, baths and much more. Within this article, we list some the best formulas that help to prevent mould and are available in a wide range of colours.

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Best Bathroom Sealant
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If you require a quick answer, the best bathroom sealant is the UniBond 2079356, which is specifically designed for warm and humid environments. However, if you require a silicone sealant that’s available in many different colours, the Everflex 500 Premium + is a great option to consider and it’s also much cheaper too.

To rate the bathroom sealants within this article, we based our recommendations upon our experience and testing of multiple formulas (as shown in the “How We Rated” section below). We also carried out hours of research and considered a number of factors. Some of the factors that we took into consideration included the formulation, ease of application, colours and tube sizes available, drying time, ability to resist mould, awarded certifications, compatible surfaces, bulk buy options and value for money.

Bathroom Sealant Comparison

Bathroom SealantColoursTube Size
UniBond 2079356White or Ivory300 ml
Everflex 500White, Grey, Ivory, Sandstorm or Clear295 ml
Dowsil 785White310 ml
Forever ClearWhite, Ivory, Grey or Clear80 or 310 ml
Gorilla Glue Multi-UseClear80 ml
151 ClearClear50 ml

Areas that often require sealing in the bathroom include the tiles, shower trays, cubical doors, bath and sanitary fittings. Although there are a range of sealants that you could use, it’s crucial that you use a formula that’s water resistant and includes fungicides to prevent the build-up of mould, mildew and other bacteria.

Below is a list of the best bathroom sealants that are easy to apply, water resistant and prevent the build-up of mould.

The Best Bathroom Sealant

1. UniBond Anti-Mould Silicone Sealant

UniBond 2079356 Anti-Mould Sealant
By far one of the most popular bathroom sealants on the market is by the UniBond brand. According to the brand, it has been specifically designed for warm and humid environments and it’s perfect for use in showers or baths.

In terms of its formulation, it’s a permanently flexible, waterproof and mould resistant sealant that’s suitable for tiled areas, bathrooms, kitchens and worktops.

Other features of the UniBond Silicone Sealant include:

  • Long lasting with high adhesion
  • Touch dry in 20 minutes
  • Fully dry in 24 hours
  • Available in white or ivory
  • 300 ml tube with resealable cap
  • Easy to clean with soap

Although expensive, the UniBond formula is the best bathroom silicone sealant that’s designed specifically for warm and humid environments. The anti-mould formulation is very easy to use with a sealant gun and it provides a long lasting finish that certainly won’t disappoint.
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2. Everflex 500 Bath & Sanitary Silicone

Everbuild EVB500WH Everflex 500 Bath and Sanitary Silicone
Another popular bathroom sealant is the Everflex 500 Premium + and it’s the only sealant within this article that’s certified under the harmonized European standard (EN15651). In terms of its usage, it’s an anti-fungal formula that’s ideal for sealing showers, baths, sanitary fittings, tiles and so much more.

Other features of the Everflex 500 Premium + include:

  • Available in clear, grey, ivory or sandstorm finishes
  • Permanently flexible
  • Fast curing formula
  • 295 ml tube
  • Prevents the build-up of mould

To conclude, the Everflex 500+ is a high quality bathroom sealant that provides an excellent waterproof finish each and every time. The only drawback when compared to the UniBond alternative is the fact that it doesn’t have a resealable cap. However, it does benefit from being much cheaper and offering additional finishes to best suit your requirements.

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3. Dow Corning Dowsil Bathroom Sealant

Dowsil 785 Sanitary Sealant
The Dowsil bathroom sealant by the Dow Corning brand is another great option to consider because it focuses upon resisting bacteria and mould. The formula also conforms to the ISO 22196:2007 and ISO 11600-F-20LM industry standards and is suitable for both domestic or commercial applications too.

Other features of the Dow Corning Dowsil include:

  • Fast curing and tack free in just one hour
  • Formula includes a fungicide to resist mould
  • Can be used in bathrooms, kitchens and sanitary fittings
  • Only available in white
  • 310 mm tube

Overall, the Dowsil formula is an excellent all-round bathroom sealant that’s developed by the reputable Dow Corning brand. The brand have even gone as far as testing this product against bacteria growth, MRSA, E. Coli and Salmonella for complete peace of mind.
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4. Everbuild Forever Clear Sealant

Everbuild Forever Anti-Mould
The Everbuild Forever Clear is an anti-mould sealant that’s perfect for areas of high humidity such as bathrooms and showers. In terms of its formulation, it contains the brand’s patented “Mould Shield”, which actively prevents the growth of mildew and mould. Once applied correctly, the brand state that there should be no mould growth for up to 10 years.

Other features of the Everbuild Forever Clear include:

  • Permanent waterproof and flexible seal
  • Available in clear, white, grey or ivory
  • Touch dry in 15 minutes
  • Available in a 295 ml or 80 ml tube
  • Can be used indoor or outdoor

Overall, the Everbuild Forever Clear is a high quality silicone formula that can be used for almost every job that requires sealing. The choice of a smaller tube size is also great bonus because it avoids any wastage of the larger tubes.
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5. Gorilla Glue Mould Resistant Sealant

Gorilla 1144301 Mould Resisrant Sealant
Gorilla Glue are a highly reputable brand that are well-known for their high performance formulas. This mould resistant sealant is a great example of that reputation and it’s perfect for shower trays, baths, sinks and so much more.

In terms of using this sealant, it’s a fast drying formula that’s water-ready in just 30 minutes. It’s also able to provide a long lasting finish that the brand states won’t turn yellow, shrink or crack.

Other features of the Gorilla Glue Mould Resistant Sealant include:

  • Versatile all-purpose sealant
  • Resists mould and mildew
  • Dries within 30 minutes
  • Lifetime guarantee
  • Suitable for indoor or outdoor use
  • Clear formulation
  • 80 ml tube

To conclude, the Gorilla Glue sealant is an excellent all-round option that combines performance with value for money. The fact that it comes with a lifetime guarantee is a clear indication of the high quality mould-resistant finish that it provides and it certainly won’t disappoint.
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6. 151 Bathroom Silicone Sealant

181 Bathroom Silicone Sealant
For smaller jobs that don’t require a large tube, it may be cheaper and easier to use a squeeze tube such as the 151 silicone sealant. It’s available in a 70 gram tube that includes an applicator nozzle and is very easy to apply.

Other features of the 151 Bathroom Silicone Sealant include:

  • Fully waterproof formula
  • Available in a clear or white finish
  • No gun required for application
  • Screw on applicator nozzle
  • Perfect for smaller jobs

Overall, the 151 formula is a cheap bathroom sealant that’s easy to apply and is designed for warm or humid environments. Whether you are sealing around a bathroom extractor fan or repairing tiles, it won’t disappoint.
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How We Rated The Sealants

As we own a number of properties (rentals and Airbnb’s), we are often replacing damaged sealant or sealing new fittings in the bathroom. As shown in the photo below, we recently sealed a bath but we’ve also used sealants for showers, toilets, tiling, window frames, kitchen surfaces and so much more. Over the years, we’ve also tried and tested a whole range of sealants from some of the most reputable brands in the UK and there is certainly plenty to choose from.

best sealant for showers

To display more of our experience with various bathroom sealants, below are some videos that we filmed and posted onto our Instagram page that shows us demonstrating how to seal a bath.

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As well as our experience and testing of multiple sealants, we also based our recommendations upon hours of research and a number of factors. Some of the factors that we took into consideration included the formulation, ease of application, colours and tube sizes available, drying time, ability to resist mould, awarded certifications, compatible surfaces, bulk buy options and value for money.

Bathroom Sealant Buying Guide

A bathroom sealant not only makes fittings such as showers or baths waterproof but it also provides the finishing touch. To help you make an informed buying decision, we have produced the below guide regarding bathroom sealants.

Caulk vs Silicone

Caulk is a popular method of sealing walls, ceilings and pieces of trim and it can also be painted over, which makes it easier to blend in with the rest of the room. However, it’s not the best option for bathrooms because it’s not completely water resistant.

A silicone sealant on the other hand is the better choice for a bathroom because it provides a waterproof barrier against moisture. However, due to the moisture repelling property of silicone, it means that it can’t be painted over.

Therefore, you’ll want to use a bathroom paint elsewhere in the room and seal the areas around the bath, sink, shower and anywhere else with the sealant.

Drying Time

The majority of bathroom sealants require 24 hours to completely dry but there are many fast drying formulas available. For example, the UniBond sealant is touch dry in just 1 hour, which allows you to get on with other tasks.

Colours Available

Most manufacturers provide a range of different colours to match your bathrooms décor. The most common include clear, white, ivory and grey due to the fact that they suit the majority of bathrooms. However, if you need to paint over the sealant, you may be able to do this using an oil-based primer that can then be painted over.

How To Use a Silicone Sealant

Application of a bathroom sealant isn’t as simple as spreading it on the surface and allowing it to dry. This is because the surface needs to be fully prepared and the gun needs to be loaded with the sealant before you can begin. Below is a brief guide to the steps required to seal surfaces within your bathroom.

1. Preparation

Before you begin, it’s vital that the surface is well prepared and completely dry. The best option would be to completely remove the old sealant, which will strip back all the grease and dirt. Once removed, you can clean the surface that’s to be sealed and allow it to dry out.

If you are worried that the surface isn’t completely clean, you can use a gel remover or even white spirit upon a damp cloth to wipe the surface.

2. Attaching to the Sealant Gun

If you are using a tube that requires a sealant gun for the application, you’ll need to correctly attach it. To do this, we recommend the following steps:

  1. Release the plunger by pressing the release at the back of the gun.
  2. Put the tube into the gun and push the plunger to the back.
  3. Cut the tip and push a nail through the hole to pierce the inner seal.
  4. Place the gun at a 45 degree angle along the joint width you want to seal.

3. Sealing

Once the surface has been prepared and the tube is loaded within the gun, you are ready to begin sealing. You’ll want to start in a corner and work across the length of the surface in a smooth movement.

If you are planning to seal a bath, we advise that you half fill it to prevent any movement once it has dried. After the sealant has completely dried, you can then empty the bath.


In order to prevent mould and mildew, you’ll have to regularly clean the sealant. Soap and other residues can instigate bacteria growth upon the sealant but catching it before it begins to spread is highly advised. However, if you do notice the growth of mould, you can use one of the many mould removers available to quickly eliminate it from the surface.


Adding the finishing touch to your bathroom with a quality sealant is highly recommended. Without using a sealant, you’ll leave areas exposed to moisture, which can then lead to water damage and bacteria growth.

All of the recommendations listed above are developed by reputable brands and suitable for a range of budgets. They also include sealants that can be applied by a gun or squeeze tube to best suit your requirements. However, if you need further information with regards to bathroom sealants, feel free to get in touch and we’ll try to provide our assistance where possible.

The Author Who Worked On This Article

author dan darimo

Dan Morgan

As a keen DIY’er, gardener and somebody that loves the latest tech, Dan is someone that brings years of experience in multiple trades. Since buying his first house, he has been obsessed with renovating properties and filling it with the latest products. This has led him down the road of testing hundreds of products and creating in-depth “how-to” and informative guides that offer his first-hand experience. Other interests include working on cars, keeping fit through sports or his home gym, caravanning and drinking great coffee.

If you would like to read more about Darimo and the authors, you can visit our about page. This goes into great detail regarding how we test products, create our guides and everything else.

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