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Best Bathroom Sealant: 6 Buys to Keep Your Bathroom Looking its Best

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what is the best bathroom sealant?
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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, 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. 

(MOREBathroom design)

Best Bathroom Sealants

The UniBond Anti-Mould Sealant is one of the best bathroom sealants

(Image credit: Amazon)

1. UniBond Anti-Mould Sealant

The best bathroom sealant overall

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

Long-lasting protection
Quick dry
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. 

Buy the UniBond Anti-Mould Sealant now 

The Everflex 500 Bath & Sanitary Silicone is one of the best bathroom sealants

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2. Everflex 500 Bath & Sanitary Silicone

A versatile all-rounder

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

Long-lasting protection
Available in 5 colours
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.

Buy the Everflex 500 Bath & Sanitary Silicone now

The Gorilla Glue Mould Resistant Sealant is one of the best bathroom sealants

(Image credit: Amazon)

3. Gorilla Glue Mould Resistant Sealant

Water-ready within 30 minutes

Size: 80ml | Colours: Clear | Waterproof: Yes

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

Buy the Gorilla Glue Mould Resistant Sealant now

The Dowsil 785 Sanitary Sealant is one of the best bathroom sealants

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4. Dowsil 785 Sanitary Sealant

The plumbers' favourite still going strong

Size: 310ml | Colour: White | Waterproof: Yes

Quick drying
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 also protects against bacteria growth, MRSA, E. Coli and salmonella.

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

Buy the Dowsil 785 Sanitary Sealant now 

The Forever Clear Anti-Mould Bathroom Sealant is one of the best bathroom sealants

(Image credit: Amazon)

5. Forever Clear Anti-Mould Bathroom Sealant

An under the radar pick, which boasts impressive results

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

Touch dry in 15 mins
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 may not be among the most well-known sealants, but it is effective in high humidity areas and more than justifies its place in this list. 

Buy the Forever Clear Anti-Mould Bathroom Sealant now

The 151 Silicone Sealant is one of the best bathroom sealants

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6. 151 Silicone Sealant

A budget option for smaller jobs

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

Easy to apply
No gun needed
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.

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.

Buy the 151 Silicone Sealant now 

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: 


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.

More Best Buys for Bathroom Jobs

Jack Woodfield

Jack is News Editor for Homebuilding & Renovating, and 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 planning reforms. Having bought his first home in 2013, he and his wife have renovated almost every room and recently finished a garden renovation.