10 Best Bath Sealants 2025 in the UK

The UniBond 2079356 Anti-Mould White Sealant is a silicone-based sealant specifically designed for use in kitchens and bathrooms, areas prone to humidity and mold growth. One of its significant strengths is its anti-mold formula, making it ideal for environments where mold and mildew are a common concern. This sealant forms a permanently flexible and waterproof barrier, which is essential for maintaining strong seals around bathtubs, showers, and sinks.

Its high adhesion ensures a long-lasting finish, provided the sealant is regularly cleaned to prevent mold buildup. Another plus is its relatively quick curing time: it becomes 'touch dry' in just 20 minutes and fully cures within 24 hours, allowing you to complete sealing jobs efficiently. The sealant comes in white, which is a versatile color suitable for most bathroom and kitchen themes. However, the product is limited to this single color option, which might be a drawback for users needing a sealant in other shades to match their decor.

Additionally, while the product is straightforward to use with a standard sealant gun, it may require some practice for those unfamiliar with applying sealants. This sealant is a strong candidate for anyone needing a reliable, mold-resistant solution for their kitchen or bathroom sealing needs.

The Sika Sikaflex-522 Caravan And Motorhome Adhesive Sealant is a versatile option for those needing reliable sealing for both interior and exterior applications in caravans or motorhomes. One of its strengths is the silicone and solvent-free formula, which offers an impressive UV and weather-resistant finish, making it excellent for areas exposed to the elements. This sealant is particularly beneficial in environments where hygiene is crucial, as it meets specific food safety standards, being ISEGA certified. Additionally, it is designed to resist mold and mildew, which is an important factor for maintaining a clean and healthy atmosphere indoors.

In terms of curing, this sealant fully cures in 24 hours, which is relatively standard and manageable for most repair tasks. The product provides good adhesion and flexibility, making it suitable for various substrates like timber, glass, metals, ceramics, and even painted surfaces, which enhances its versatility in home repair projects. Its color stability under UV exposure is another highlight, ensuring the white color remains consistent over time without significant discoloration.

However, the product comes in a limited color option, which might not be suitable for users needing diverse color choices for specific aesthetic matches. While it's effective for applications in caravans and motorhomes, users looking specifically for bath sealants might find its niche orientation less relevant, depending on their specific needs. The 300ml volume should be sufficient for moderate-sized projects, but larger tasks may require multiple tubes, potentially increasing the cost.

The Sika Stixall Extreme Power Sealant and Adhesive in Black is a versatile option in the bath-sealants category. It uses hybrid polymer technology, which is a strong point for its superior initial grab strength and flexibility. This makes it suitable for various surfaces such as glass, metals, and wood, even in challenging conditions like underwater or during rain. The product is waterproof and resistant to temperature extremes, enhancing its durability for long-term application.

One of the standout features is its quick skin-time of just 10 minutes, though users will need to wait up to 144 hours for full curing. This extended curing time might be a drawback for those seeking a quicker finish, but the ability to paint over it with water-based paints after drying offers creative flexibility.

While not explicitly stated, the product’s mold and mildew resistance is implied through its waterproof and chemical-resistant properties, which is crucial for bathroom use. It's especially noteworthy for both interior and exterior applications, though the Crystal Clear variant is not recommended for outdoor use.

In terms of color options, Sika Stixall offers a range, including Black, Brown, Anthracite, White, Crystal Clear, and Grey, giving users the freedom to match their sealant with their decor. The sealant is user-friendly, requiring only a caulking gun to apply, which makes it accessible for DIY enthusiasts. However, the packaging size of 290ml might be limiting for larger projects unless more tubes are purchased.