Best Bathroom Sealant and Shower Sealants (Reviews) in 2023

Welcome to our 5-minute guide to the best bathroom sealant products on the market in 2024. In our list below is a range of the top selling sealants suitable for finishing up tiles, shower trays, cubicle doors, bathtubs, sanitary ware and more!

There are a tonne of cheap “no-name” bathroom sealants available, and WE’D AVOID THEM COMPLETELY.

Don’t have time to read? Here is our list of the best bathroom sealants and shower sealants:

1. Everbuild 500 (Our Top Pick)

2. UniBond Anti-Mould Sealant

3. Dow Corning 785

4. Everbuild C3 Showerproof Sealant

Best Bathroom Sealant (Waterproof)

The silicone you use, and how it looks after application, is the finishing touch on a bathroom that’s likely to have cost thousands of pounds. Given even the best shower sealant products tend to cost less than £10, you’re risking ruining the look of your bathroom to save £1-2. That’s just not worth it.

Below, we’ve covered the top 4 anti-mould bathroom and shower sealants that are currently available in the UK, and sold throughout popular bathroom, plumbing and tiling merchants.

#1 – Everbuild 500 (Our Top Pick)

Here’s a top seller, and not just online. The Everbuild 500 sealant was considered one of the best shower sealant products at my time working at a local plumbing merchant, and for good reason.

Anti-Mould

Everbuild 500 has anti-bacterial properties to prevent mould build-up; you won’t get that with cheap no-name sealant brands.

All bathroom sealants are waterproof. That’s one of things that make them bathroom silicone, not your average silicone.

However, make sure you check the label of the silicone you’re buying — NOT ALL bathroom and shower sealants are anti-mould.

So, whilst you might be able to get the perfect finish to begin with, this will fade quickly. Once mould starts to set in silicone, it’s REALLY hard to remove. In fact, the quickest way to eliminate mould from bathroom sealant is to remove the silicone completely and start again.

Basically, it makes sense to ensure you have a waterproof and anti-mould sealant to start with, rather than having to reseal your bathroom a year or so down the line.

Anti-Aging

The thing with Everbuild 500, isn’t just the fact that it has anti-mould (via a Fungicidal formula) properties.

Its format means that the silicone won’t discolour with age. And that’s a huge bonus. A lot of cheap bathroom sealants will discolour after 9-12 months, even if the seal is still solid, and mould hasn’t found its way in.

Either way, once silicone discolours, your bathroom looks aged. This means you’ll be reapplying silicone once every year. But with Everbuild 500, you shouldn’t have this problem.

Quick Drying

Everbuild 500 cures in a reasonable amount of time. In fact, you can expect it to be tacky within 45-60 minutes. Better still, it won’t pick up dirt when its drying and when it’s bone dry (24-36 hours), and it’s permanently flexible, which reduces the chances of the seal breaking.

Ideal Applications

You’ll be able to use the Everbuild 500 in all aspects of bathroom sealing. That means everything from sanitary ware and shower trays, to basins, baths and even showers doors.

Online Reviews

And, you can go ahead and see what other people think of the Everbuild 500 bathroom sealant. Across multiple ecommerce stores, there are over 100 reviews from satisfied customers that have used this product in their bathroom.

Looking to finish up your bathroom with a product that doesn’t age? Everbuild 500 is the silicone for you.

Check price on Amazon

#2 – UniBond Anti-Mould Sealant

Next, we’ve got the anti-mould sealant from UniBond. For those that don’t know, UniBond is one of the most popular brands for everything from plaster through to shower tray sealant, and other finishing products.

And, it’s not a small company. UniBond employ 50,000 people globally. You don’t employ that many people, selling products at £10 or so per-pop, unless your products are the best-of-the-best.

Anti-Mould

Like Everbuild, you’ll get some anti-mould protection built-in to the UniBond bath sealant, keeping it look fresh for years to come.

Ideal Applications

Most of UniBond’s products are specialist, but multi-purpose at the same time. You’ll be able to use this in the kitchen (such as on worktops), and in your bathroom/shower room. And, you’ll be sealing everything including:

• Shower Trays
• Shower Doors
• Baths
• Sanitary Ware

Resealable

UniBond is one of the few bathroom silicone manufacturers that have integrated a resealable cap into their tube design. That means you’ll be able to store it and use it again.

For the average trades person, having the need to reseal a tube isn’t really a big deal; they’ll go through more than one daily. But what if you’re patching up round a bath or looking to do bits at a time?

Online Reviews

There are a handful of top shower sealants online, and these get a tonne of rave reviews.

Of them all, UniBond gets the most positive feedback. That’s because the price is fair, the quality is high, and it’s one of the few bathroom sealants that are reusable. And, if you’re just patching up, that’s going to save you buying a new tube of silicone next time.

How To Use UniBond

UniBond is strong and reliable, and using it relies on preparation.

Here’s how to use and apply UniBond bathroom sealant:

1. Clean surfaces of ALL existing sealant, dust and dirt
2. Ensure all areas of application are dry, even light moisture affects the end result
3. Cut the tip of cartridge, just above the screw thread, at a 45-degree angle, and at a joint width to suit the area you’re applying the silicone to
4. After screwing the nozzle onto the cartridge, insert into your silicone gun
5. Apply with even pressure for the best finish
6. Within 5 minutes of application, use a silicone finishing tool to remove imperfections
7. Allow room to breathe, and make sure it’s free from dust while the sealant dries
8. Allow a minimum of 24 hours for the silicone to dry

Check price on Amazon

#3 – Dow Corning 785

Dow Corning are another great bathroom sealant brand. And, their Dow 785 shower, bath and sanitary sealant is one of the best sellers.

Anti-Bacterial

The Dow Corning 785 is created in a similar way to UniBond. It has an anti-fungal component that wards off mould outbreaks, so you can rest assured that this sealant will keep your bathroom looking — and smelling — fresh.

Quick Drying

One reason people love Dow 785, is the fact it’s quick-drying. That’s important, because the longer silicone needs to dry, the more chance that dust and dirt finds its way in. And if your new silicone gets dirty, you’re back to square one — ripping off the sealant and applying it again.

Ideal Applications

Like UniBond, Dow Corning 785 can be used for all types of bathroom and shower products. That means the usual:

• Shower Trays
• Shower Doors
• Baths
• Sanitary Ware

Online Reviews

While Dow 785 has fewer consumer reviews than UniBond, the ones you’ll find are generally positive. And, I can attest that at my time working at a plumbing merchant’s, we’d sell dozens of tubes of this sealant every day.

Check price on Amazon

#4 – Everbuild C3 Showerproof Bathroom Sealant

Everbuild make a tonne of different bonding products, including their popular C3 ShowerProof Bathroom Sealant.

Anti-Mould

As we’ve mentioned, you don’t want any sealant in your bathroom that doesn’t have either anti-bacterial or anti-mould properties. And, with the Everbuild C3, you’ve got anti-fungal properties that reduce the chance of mould finding its way into the silicone. Once that flexible rubber seal is in place, nothing is getting inside.

Ideal Applications

There’s a tonne of different applications for which Everbuild C3 is suitable:

• Shower Trays
• Worktops
• Basins
• Toilets
• Shower Doors
• Baths

Online Reviews

Like all the bathroom sealants on this list, you’ll be able to find plenty of positive online reviews for the Everbuild C3. If you’re looking for alternative to the UniBond and 785 mentioned above, Everbuild should be the top of your shortlist.

Check price on Amazon

How to Choose Bathroom Sealant

Choosing bathroom sealant isn’t rocket science — mostly, you just need to ensure that your chosen brand has 2 distinct qualities:

• It’s mould resistant — Bathrooms accumulate moisture and are dark more than half the time, and mould couldn’t ask for a better climate to grow and flourish. If your bathroom sealant can’t resist this pesky intruder, it’ll quickly succumb to the next mould outbreak and you’ll be back at ground zero — applying replacement bathroom sealant. To avoid the avoidable, make sure your bathroom sealant has anti-fungal properties.
• It cures fast — You want your bathroom to be back in service without unnecessarily long delays. And, this means the bathroom sealant of your choice should be able to seal and cure as quickly as possible. The best bathroom sealant products, like those we mentioned above, cure in a reasonable amount of time.

Apart from the 2 factors above, consider the effects your bathroom sealant may have on your family’s well-being before it cures. Check the bottle for mentions of allergens and sensitizing substances — if the product contains any, plan the sealing procedure in a way that reduces your family’s exposure to the sealant.

FAQs About Bathroom Sealant

Is bathroom sealant toxic?

Yes — bathroom sealants contain toxins that are classified as Volatile Organic Compounds (VOCs). Whilst the silicone or latex itself is perfectly safe, the solvent used to keep it liquid are packed with toxins and carcinogens.

This is why it’s vital to plan your bathroom sealing project wise. Once applied, these VOCs will off-gas for a certain period of time, at least as long as the sealant cures, and may be longer. This being the case, make sure that you and your family will not have to use the bathroom in questions (or be in its immediate vicinity) for at least 24 hours.

Can you use bathroom sealant outside?

Generally, yes — you can use silicone, latex, and polyurethane caulks outdoors. That said, some sealants may not fare well with constant UV exposure, so it’s always best to make sure the product you choose is rated for exterior use.

Is bathroom sealant conductive?

While most bathroom sealant is not conductive, its purpose is to protect your bathtub and wall assembly from moisture ingress and mould build-up, not insulate wires. If you need to coat electrical wiring with an insulative layer, be sure to always use a specially rated sealant.  

Can I use bathroom sealant as adhesive?

If the bathroom sealant packaging says “adhesive caulk” or something along these lines, then yes — you can definitely use it as an adhesive. Doing so will help you avert mould outbreaks, something to which traditional mortars are often vulnerable.

Note that if you’re using bathroom sealant as an adhesive, you should apply a thicker layer of it than you would with glue.

What tools do I need to apply bathroom sealant?

If you’ve not got one already, you’ll need a caulking gun and a silicone finishing tool.

There’s plenty of durable but cheap caulking guns available here. And, you can grab the best silicone finishing tools here.

Conclusion

Thanks for reading our 5-minute guide to the top anti-mould bathroom sealants.

We regularly post up reviews on bathroom products, and free plumbing advice, so bookmark our blog and drop back soon.

And, if you have any questions, leave a comment below and we’ll get back to you as soon as possible.