Your Guide to Choosing the Right Bathroom Sealant

Dealing with cracked, discoloured or mouldy sealant around your bath, shower or sink is a common household frustration. Not only does it look unsightly, but a failing seal can lead to water damage and further mould growth. Choosing the right bathroom sealant can feel overwhelming with so many options available.

This guide is designed to help you understand the different types of sealants and find a suitable solution for your home maintenance project, whether you're a seasoned DIYer or tackling this task for the first time. We'll look at key features to consider and highlight a few products for different needs.

Choosing the Right Sealant for Your Bathroom or Kitchen

Before you make a purchase, it helps to consider a few key factors. The right choice depends on the job at hand, your DIY confidence level and the result you want to achieve.

1. Understand the Sealant Type

The first step is to decide which type of product fits your situation:

• Traditional Silicone Sealant: This is the standard for creating a durable, long-lasting and waterproof sealant bead. Applied with a cartridge gun, it requires removing the old sealant first. It offers a professional finish and is ideal for new installations or when you want to completely reseal a bath or shower.
• Sealant Renewers: These are designed to be applied directly over existing sealant. They are a convenient option for covering up stains, mould or minor cracks without the difficult task of scraping away the old bead. They offer a quick cosmetic refresh.
• Sealant Tape: A self-adhesive sealant tape provides a mess-free alternative to tubes and guns. You simply cut it to size and press it into place. It's particularly useful for creating neat, straight lines and for those who are not comfortable using a sealant gun.

2. Look for Essential Features

For wet areas like bathrooms and kitchens, certain features are non-negotiable:

• Mould Resistance: Always look for a product labelled as an anti mould sealant or mould resistant sealant. These contain fungicides that help to prevent the growth of black mould, keeping your seals looking clean and hygienic for longer.
• Waterproofing: A sealant's primary job in a bathroom is to create a watertight barrier. Ensure the product is explicitly stated as being waterproof and suitable for sanitary applications like a shower sealant.
• Flexibility: Bathrooms experience temperature changes and slight movements. A good sealant needs to be flexible enough to accommodate this without cracking or pulling away from the surface.

Top Bathroom Sealant Recommendations

Here are our recommendations, selected to address different user needs, from quick fixes to full replacements.

For a Quick and Easy Refresh: Unibond Renew Sealant Mould Resistant 80ml

Why It Stands Out: This product’s main advantage is its simplicity. It is specifically formulated to be applied directly over old sealant, saving you the time and effort of removing the existing bead. The integrated smoothing tool helps to achieve a clean finish without needing extra tools.

Pros:

• No need to remove old sealant.
• Easy-to-use applicator with a built-in smoothing nozzle.
• Mould resistant formula for a lasting clean look.
• Dries quickly for a fast turnaround.

Who is it for? This is an excellent choice for DIY beginners, tenants in rented properties or anyone looking for a fast and effective way to refresh tired-looking sealant without undertaking a full removal and replacement project.

For a Durable, Long-Term Solution: Unibond Sanitary Silicone Sealant Cartridge

Why It Stands Out: As a traditional silicone sealant, this product is designed to provide a highly durable and long-lasting waterproof seal. It requires a cartridge gun for application and is the go-to choice for a full reseal bath project or a new bathroom installation, offering a professional-grade finish.

Pros:

• Creates a robust, long-lasting watertight seal.
• Formulated to be an effective anti mould sealant.
• Adheres well to a variety of surfaces including ceramic, glass and metal.
• The translucent finish provides a discreet, clean look.

Who is it for? This is aimed at homeowners and DIYers who are prepared to remove the old sealant to achieve a fresh, durable and professional finish that will last for years. It's ideal for bathroom renovations and new fittings.

For a Mess-Free Application: Polycell White Bathroom and Kitchen Sealant Tape

Why It Stands Out: This sealant tape eliminates the need for guns, tubes and smoothing tools. It’s a self-adhesive strip that you simply cut to length, peel and press into place. It’s a straightforward way to create a neat seal, especially along straight edges.

Pros:

• Extremely easy to apply with no mess.
• No special tools required.
• Provides a neat, uniform finish.
• Flexible and can be wiped clean.

Who is it for? This is perfect for anyone who lacks confidence with sealant guns or wants the quickest, cleanest possible solution for sealing straight gaps around baths, sinks and worktops. It's also a great option for quick repairs.

Looking for More Options?

While these recommendations cover some of the most common needs, every project is unique. You might be looking for a specific colour, a different size or a sealant for another application.

For a wider selection of products, feel free to explore our full Adhesive Sealant category.

Frequently Asked Questions About Bathroom Sealant

How do you reseal a bath?

To properly reseal a bath, you should first completely remove the old sealant using a sealant remover tool and a solvent if needed. Clean the area thoroughly with a product like methylated spirits to ensure it is completely dry and free of dust or residue. Apply the new silicone sealant in a continuous bead, then use a smoothing tool or a wet finger to create a neat, concave finish. Finally, allow it to cure for the time specified on the packaging, typically 24 hours.

Is there a difference between kitchen and bathroom sealant?

Both kitchen sealant and bathroom sealant need to be waterproof and mould resistant due to the high humidity in both environments. Often, a product labelled as "Sanitary" or "Bathroom & Kitchen" is suitable for both. The main differences can sometimes be in the available colours or specific formulations for adhesion to materials common in each room, but a high-quality sanitary sealant is generally versatile enough for either.

How long should you leave bathroom sealant to dry?

Drying times vary by product. Most silicone sealants are touch-dry within an hour, but they require a full 24 hours to cure completely and become fully waterproof. It is crucial to avoid exposing the new sealant to water until it has fully cured. Always check the manufacturer's instructions on the product packaging for specific timings.