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Sealants and sealant kits are widely used by both hobbyists and professionals for a broad range of protecting and waterproofing jobs. The best sealant type to use in a given scenario will depend on the surface materials and the location of the seal. There are many varieties of sealants, putties, and sealant remover kits on sale, with leading brands including Dow Corning and Bostik. While most tend to fall within one of a few basic categories - cement sealants, chemical sealants, or silicone sealants - there are also a number of sealants designed for more specialised purposes.

### What's the difference between sealant types?

**Silicone sealants** - among the most widely available sealant types, and ideal for a wide array of household, DIY and construction tasks.

**Acrylic sealants** - often a cheaper alternative to silicone for use on wood, aluminium, and UPVC, and can also be painted. They're less flexible than most silicone versions, and more prone to eroding under certain application conditions.

**Polyurethane foam sealants** - extremely flexible/elastic and highly waterproof, ideal for sealing most metals and fibreglass.

### Why is sealant modulus and cure type important?

**High modulus** sealants are less elastic but more hardwearing, and better suited to indoor applications as a kitchen or bathroom sealant (around baths, showers, sinks and worktops).

**Low modulus** sealants offer better flexibility and adhesion where slight movement of the joint may be a factor, but are less hardwearing overall. They're generally best for outdoor and weather-resistant applications (perimeter seals and exterior UPVC).

Most sealants are available in one of two cure types - **acetoxy** and **neutral**.

- High modulus sealants tend to be **acetoxy cure**, meaning they'll cure faster and harder, and will emit a slight vinegar smell while doing so.
- Low modulus sealants are often sold in **natural cure** variants, meaning they adhere better to a greater range of surfaces, cure slowly to a more elastic consistency, and give off little odour.


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Sealants | Sealant Kits | Silicone Sealants | RS

Sealants

Bostik Bond-Flex 100HMA Transparent Sealant Non-Slump Paste 300 ml...

Bostik Bond-Flex 100HMA Black Sealant Non-Slump Paste 300 ml Cartridge

Bostik Bond-Flex 100HMA White Sealant Non-Slump Paste 300 ml Cartridge

Bostik Born2Bond Orange Thread lock 45 min Cure Time

RS PRO Transparent Sealant Paste 310 ml Cartridge

Alpha Adhesives & Sealants Ltd Alpha 124 Clear Sealant Liquid 75...

Alpha Adhesives & Sealants Ltd Ultrabond 007 Black Sealant Liquid...

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Black Silicone Sealant | RS

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Low Modulus Sealants | RS

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Silicones Sealants | RS Components

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Silicone Sealants | RS

<p>Silicone sealants are adhesives that are most often used to create a water or airtight seal in the joint between two surfaces. Silicone sealant has a gel consistency which cures by drying over a period of time, with the correct temperature and humidity. The cured product is a durable yet flexible, silicone rubber. </p><h2>Why use a silicone sealant?</h2><p>They are very easy to use and enable you to create a waterproof join with minimal effort. The sealants are weatherproof and can withstand a wide range of temperatures. The sealants bond to many different materials, are long-lasting and do not promote mould growth. </p><h2>Types of Silicone Sealants:</h2><p>Silicone sealants come in a range of different colours such as black, grey, white and clear. They typically come in a cartridge or tube and many have a nozzle for precise bead application. There are squeeze tubes which are used by hand or rigid tubes for use with a sealant gun. Silicone sealants use different chemicals such as acetoxy, alkoxy and elastomer. It is essential that you choose the relevant chemical base for your application. Most silicone sealant is multi-purpose and can be used for general applications and bonds with many materials. Sanitary silicone sealants are best for wet applications for example in bathrooms. This is because they are resistant against mould and mildew. </p><p>Other things to consider when purchasing a silicone sealant is whether it is suitable for indoor or outdoor use, is it mould resistant, or whether you have any specific operating temperatures that could affect the efficiency of the silicone. Both heat and cold can affect silicone sealant and compromise its ability to seal.</p><h2>What are they used for?</h2><p>Silicone sealants are commonly used in both domestic and commercial environments. They are an essential DIY material for use as a bathroom sealant or in window construction. Other applications include:</p> <ul><li>Shower sealing</li><li>Window glazing and doors </li><li>Cooker and fridge sealing </li><li>Plumbing joints</li><li>Electrical repair</li><li>Wire entry seal</li><li>Junction protection</li></ul>

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Adhesive Sealants | RS

<p>Adhesive sealants, also known as hybrid sealants or combined sealants, offer an innovative solution to sealing, with the flexibility and elasticity of a sealant and the high strength and durability of an adhesive. This makes them a perfect adhesive for gap filling and general-purpose adhesion between two surfaces. The sealants and adhesives once dried can be painted over and are weatherproof, making them ideal for a variety of bonding and sealing applications.</p> <h2>What are the benefits of adhesive sealants? </h2> <p>Combined adhesives and sealants are versatile as they combine silicone and polyurethane sealant to create a multipurpose sealant that can bond with a range of materials, such as concrete, wood, metal and plastic. In general, adhesive sealants benefit from low odour, a large temperature range and good movement capability. They offer a good initial grab rate, which gives them more flexibility, whilst also being very resilient. The adhesives are UV stable, and do not yellow or degrade.</p> <h2>Applications and Uses</h2> <p>The new adhesive technologies of a hybrid adhesive can bond with a wide range of substances and materials, making them useful in both interior and exterior applications. They come in a variety of colours, sometime clear, and can also be painted over. Relevant applications may include glazing and windows, flooring, and as a gap filler. </p>

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