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Best Bathroom Sealant: Brilliant Buys to Protect Your Bathroom and Keep it Fresh

Which is the best bathroom sealant?
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Buying the best bathroom sealant is an important step to ensure your bathroom looks its best.

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 is the Best Bathroom Sealant?

UniBond Anti-Mould Sealant

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1. UniBond Anti-Mould Sealant

Easy to use with long-lasting protection

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

Nozzle could be sturdier

UniBond’s silicone sealant features an anti-mould formula that is optimal for use in warm in humid environments. It forms a permanently flexible and waterproof seal (which reduces the chances of the seal breaking) that 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. It provides a long-lasting finish and is available in two different colour options.

Buy the UniBond Anti-Mould Sealant

Gorilla Glue Mould Resistant Sealant

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2. Gorilla Glue Mould Resistant Sealant

An under-rated product that dries extremely quickly

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

Once applied, the versatile Gorilla Glue Mould Resistant Sealant is water-ready within 30 minutes. 

It's mould resistant, 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.

Buy the Gorilla Glue Mould Resistant Sealant

Everflex 500 Bath & Sanitary Silicone

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3. Everflex 500 Bath & Sanitary Silicone

Offers long-lasting protection against mould growth

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

Doesn't discolour over time
Long-lasting protection
Can be tricky to squeeze the sealant out

The Everflex 500 anti-mould sealant from Everbuild is efficient across all areas of bathroom sealing. 

It is permanently flexible and incorporates a powerful fungicide into the formula, providing long-lasting protection against mould growth.

It also dries quickly: wait around an hour for it to be tack free, and roughly 24 hours for it to be completely dry.

Even better, it will not discolour on ageing, even in humid or damp conditions.

Buy the Everflex 500 Bath & Sanitary Silicone

Forever Clear Anti-Mould Bathroom Sealant

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4. Forever Clear Anti-Mould Bathroom Sealant

Delivers touch-dry sealant within 15 minutes

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

Dowsil 785 Sanitary Sealant

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5. Dowsil 785 Sanitary Sealant

This will keep your bathroom looking and smelling fresh

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

Quick drying
Resists mould
Available in just one colour

Dowsil, formerly known as Dow Corning, is another leading name when it comes to sealants, and the 785 Sanitary Sealant is its best product.

This white silicone sealant possesses a fungicide formula that resists mould to keep your bathroom looking and smelling fresh, and it is an extremely quick-drying product: it should be tack free in under one hour. 

Buy the Dowsil 785 Sanitary Sealant 

Best bathroom sealant

(Image credit: Amazon)

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 a small job, 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 

How to Choose Your 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. 

These are some of the key qualities to bear in mind when buying a bathroom sealant: 


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.