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Choosing the Best Bathroom Sealant

shower floor wet

It is a given that sealing joins in wet areas like bathrooms requires a different type of caulk than say those used in places where substrates like dry timber or masonry are featured.

But on top of the overall need for a ‘wet area silicone’, there are things to consider within this that can influence the choice of which brand or variant to go with.

Here are the factors –

Mould and Mildew

For around joins where moisture could get trapped, such as between inset sinks and the benchtop, there is a risk of mould or mildew build up. It is unsightly, but also could present a health risk. To reduce the risk of this, there are silicones available that not only seal the join, but also are more resistant to mould build up; with these silicones, however, it is still essential to thoroughly clean the surface first, as any foreign particles can still produce mould after the fact. One downside is that the more this type of sealant starts to age, the higher the risk of cracking. Obviously cracking means that its fundamental purpose is compromised.


Sometimes a joint to be sealed is between a painted wall and another substrate. In order to maintaining décor consistency, a paintable silicone is required to hide the join. Some wet area silicones are paintable, however – some of them won’t take paint very well, and its elasticity will cause the paint to crack or split in a very short amount of time.

Hold Power

Finally – treat any type of generic sealant as just that. Resist the temptation to overuse the product by forcing it to take any weight strain; it is, whilst being very sticky, it’s not glue.

For situations where a stronger hold is required, companies are now developing hybrid products that have some holding power as an adhesive, but these are in the minority. An example of a product that offers high performance on both sides of the coin is GP360, a neutral curing silicone adhesive sealant from Allfasteners.

Of course, checking the product’s TDS sheet  is critical, but a product like GP360 is developed to inhibit mould build up (referred to as a ‘sanitary sealant’) as well as to have holding power, such as when used to install glass shower screens and the like. And the neutral curing properties means that contact with metals and glass is far less likely to result in corrosion.

Beyond the bathroom, a product like GP360 can also be use in other moisture-prone environments – roofs, gutters, electrical sealing and weather sealing. 

Find Out More

Got any questions as to which is the right bathroom sealant for your application? Speak to Allfasteners now.