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The 6 Best Bathroom Sealants to Keep Your Bathroom Fresh

Young woman sealing joints with a plastic composition and the help of a sealant gun in a bathroom
(Image credit: Getty Images)

Owning the best bathroom sealant is an important step to ensure your bathroom remains fresh, dry and clean. 

Bath and shower rooms are subject to wet and humid conditions, so to prevent water damage and the growth of mould ruining your bathroom design, you need to apply a suitable sealant around your sanitaryware, including sinks, baths and shower trays.

It is best to use silicone sealant in your bathroom. While caulk is a popular method of sealing for walls it is not the best option for bathrooms as it is not completely waterproof. 

These are the best bathroom sealants for the job which are available now. 

Best Bathroom Sealants

UniBond Anti-Mould Sealant

(Image credit: UniBond)

1. UniBond Anti-Mould Sealant

The best bathroom sealant overall

Specifications

Size: 300ml
Colours: White or Ivory
Waterproof: Yes

Reasons to buy

+
Anti-mould
+
Resealable 
+
Long-lasting protection
+
Quick dry

Reasons to avoid

-
Nozzle could be sturdier

UniBond’s Anti-Mould sealant is a top pick for any household, especially if your primary focus is ensuring long-lasting protection.

Its high adhesion formula helps to create a durable result that will stay consistent, and once applied, it forms a permanently flexible and waterproof seal, which reduces the chances of the seal breaking.

UniBond's anti-mould formula is optimal for use in warm in humid environments (including kitchens), helping to quickly seal around your bath, toilet or kitchen sink and look professional again — remarkably, it is touch dry in just 20 minutes. 

The attached sealant gun makes it easy to use, and an integrated resealable cap is handy so you can do little bits at a time without worrying about the product drying out. 


Everbuild Everflex 500 Bath & Sanitary Silicone

(Image credit: Everbuild )

2. Everbuild Everflex 500 Bath & Sanitary Silicone

A versatile all-rounder

Specifications

Sizes: 295ml, 310ml
Colours: White, Ivory, Translucent, Sandstone, Manhattan Grey
Waterproof: Yes

Reasons to buy

+
Anti-mould
+
Long-lasting protection
+
Available in 5 colours

Reasons to avoid

-
Can be tricky to squeeze the sealant out

A close second-place, Everbuild's Everflex 500 anti-mould sealant is a great model, and efficient across several fronts. 

Long-lasting protection? Check. It incorporates a powerful fungicide into the formula, providing long-lasting protection against mould growth.

Dries quickly? Check. A skin will form within 10 minutes after application, then you'll need to wait around an hour for it to be tack free, and roughly 24 hours for it to be completely dry.

Moreover, it is hygiene and sanitary safe, and is specifically designed to seal and protect areas where maximum hygiene protection is required. It's also available in five different colours.


Gorilla Glue Mould Resistant Sealant

(Image credit: Gorilla Glue)

3. Gorilla Glue Mould Resistant Sealant

Water-ready within 30 minutes

Specifications

Size: 80ml
Colours: Clear
Waterproof: Yes

Reasons to buy

+
Comes with reusable nozzle
+
Fast drying formula
+
Great for touch-ups

Reasons to avoid

-
You will need multiple packs to seal a whole bathroom suite

One of the best bathroom sealants for quick drying — once applied, the versatile Gorilla Glue Mould Resistant Sealant is water-ready within 30 minutes, the fastest water-ready dry time on this list.  

It's mould resistant too, can be used on all surfaces, and comes with a lifetime guarantee that it will not lead to cracks or shrinks. 

What's more, it comes with a reusable nozzle making it very easy to apply. Although it only comes in 80ml bottles, so you'll need to buy in bulk for larger sealant jobs. 


Dowsil 785 Sanitary Sealant

(Image credit: Dowsil)

4. Dowsil 785 Sanitary Sealant

The plumbers' favourite still going strong

Specifications

Size: 310ml
Colour: White
Waterproof: Yes

Reasons to buy

+
Quick drying
+
Anti-mould

Reasons to avoid

-
Available in just one colour

This product from Dowsil, formerly known as Dow Corning, has been around for many years, and it remains of the most popular sealants on the market. 

The 785 Sanitary Sealant is a leading product which is particularly popular among plumbers. It utilises a fungicide formula that resists mould to keep your bathroom looking and smelling fresh, and it protects against bacteria growth, MRSA, E. Coli and salmonella.

It dries quickly too — it should be tack free in under one hour. 


Everbuild Forever Clear Anti-Mould Bathroom Sealant

(Image credit: Everbuild )

5. Everbuild Forever Clear Anti-Mould Bathroom Sealant

This sealant boasts impressive results

Specifications

Sizes: 80mm squeeze tube, or 295ml tube
Colours: White, Ivory, Grey or Clear
Waterproof: Yes

Reasons to buy

+
Touch dry in 15 mins
+
Anti-mould

Reasons to avoid

-
Not the easiest to use

The Forever Clear’s patented Mould Shield is this sealant's main highlight, which actively prevents the growth of mildew, mould and bacteria. 

It can be touch dry within 15 minutes of application thanks to its high-quality drying formula, plus it includes an anti-bacterial additive which helps to combat against new germs. It's also effective in high humidity areas.


151 Silicone Sealant

(Image credit: 151 )

6. 151 Silicone Sealant

The best bathroom sealant for small jobs

Specifications

Sizes: 70g
Colours: Clear, White
Waterproof: Yes

Reasons to buy

+
Easy to apply
+
No gun needed

Reasons to avoid

-
Not as long-lasting as others on this list

The 151 Silicone Sealant is a good option if you only need a small amount of sealant for small bathroom jobs, such as repairing tiles. Of course, if you need a little more, it's also available in a pack of six (opens in new tab).

It's not as long-lasting as others on this list. But It's affordable, easy to apply, and includes a screw-on applicator nozzle so you don't need a gun for application. It's also available in two different colour options.


How to Choose the Best Bathroom Sealant

Without a bathroom sealant, you risk exposing areas of your bathroom to moisture, which can lead to the growth of mould and water damage. 

It's an important purchase to make, so bear some of these key qualities in mind when buying: 

Anti-Mould

Your bathroom sealant needs to protect against mould. If it isn’t, you may end up regularly replacing your sealant and beginning the whole process again. 

Drying Time

The majority of reputable bathroom sealants will completely dry within a hour.

How We're Testing Bathroom Sealants

There's a lot to consider when buying one of the best sealant for your bathroom, and the Homebuilding & Renovating team is getting hands-on experience with the products in this buying guide to help you feel confident in choosing the right product for you. 

In our ongoing independent reviews we are testing the ease of use and drying time to gauge each product’s efficacy, and assessing key factors including whether it's waterproof and the range of colours it comes in. 

Our team is passionate about DIY and home improvement (which probably won’t be a surprise) so we already have detailed knowledge about the brands that make these products. 

Moreover, we have taken into account user reviews when compiling this buying guide, and gleaned key information from our sister sites such as Real Homes and Ideal Home to help you find the best bathroom sealant for your home.

Jack Woodfield
Jack Woodfield

Jack has worked in journalism for 11 years and is the News Editor for Homebuilding & Renovating, a role he has had since 2019. He strives to break the most relevant and beneficial stories for self builders, extenders and renovators, including the latest news on the construction materials shortage and hydrogen heating. In 2021 he appeared on BBC's The World at One to discuss the government's planning reforms. 


He enjoys testing new tools and gadgets, and having bought his first home in 2013, he has renovated every room and recently finished a garden renovation.