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Sealants & Adhesives

Sealants and adhesives are essential for bonding, sealing, and protecting materials in construction and DIY projects. Whether you’re fixing, filling gaps, or creating waterproof seals, our range includes high-performance products suitable for a wide range of applications.

From grab adhesives for strong instant bonding to silicone sealants for flexible waterproof finishes, we supply reliable solutions for both trade professionals and home users.

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    Bostik Pro Sealant S21 Multi-Purpose Silicone Grey 310ml (30623110)

    Bostik S21 Silicone is a professional-grade acetoxy silicone sealant designed specifically for both glazing and sanitary joints. Its low modulus property ensures flexibility while maintaining durability, making it suitable for various applications across...
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    Bostik Pro Sealant S21 Multi-Purpose Silicone White 310ml

    Bostik S21 multi purpose Silicone Sealant is a professional grade, acetoxy silicone sealant for sealing glazing, frame and sanitary joints. This low modulus silicone sealant is suitable for interior and exterior use and offers up to 20% movement...
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    Bostik Pro Sealant S30 Acetoxy Sanitary Silicone Grey 310ml

    Professional grade acetoxy silicone sealant for sanitary joints. S30 is a professional grade acetoxy sanitary silicone sealant developed for sealing sanitary joints. Sanitary joints are continually exposed to moisture and humidity. This acetoxy silicone...
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    Bostik Pro Sealant S30 Acetoxy Sanitary Silicone White 310ml

    Professional grade acetoxy silicone sealant for sanitary joints. S30 is a professional grade acetoxy sanitary silicone sealant developed for sealing sanitary joints. Sanitary joints are continually exposed to moisture and humidity. This acetoxy silicone...
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    Bostik Pro Sealant S31 Sanitary Silicone Grey 310ml

    The Bostik S31 Neutral Cure Sanitary Silicone Sealant is a professional grade, neutral cure silicone sealant developed for sealing sanitary joints that are continually exposed to moisture and humidity. S31 is a great sealant that adheres well with...
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    Bostik Pro Sealant S31 Sanitary Silicone White 310ml

    The Bostik S31 Neutral Cure Sanitary Silicone Sealant is a professional grade, neutral cure silicone sealant developed for sealing sanitary joints that are continually exposed to moisture and humidity. S31 is a great sealant that adheres well with...
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    Bostik Pro Sealant S41 Window & Door Frame Silicone Anthracite 310ml

    This S41 Neutral Cure Window & Door Frame Silicone Sealant by Bostik is a professional grade neutral cure silicone sealant, developed for sealing window and door frame joints. This silicone sealant is anthracite in colour, but it is also available in...
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    Bostik Pro Sealant S41 Window & Door Frame Silicone Clear 310ml

    S41 is a neutral cure window and door frame silicone sealant made by Bostik. This S41 sealant is a professional grade neutral cure silicone sealant, developed for sealing window and door frame joints. Suitable for interior and exterior applications,...
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    Dowsil 791 Weatherproofing Sealant Black 310ml

    This Dow Corning Weatherproofing Silicone is designed to protect areas from a variety of weather problems, including (not exclusive to) pollution, temperature extremes particularly during the summer and winter months and rain. The Silicone can be used...
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    Dowsil Corning 785+ Sanitary Silicone Sealant Clear 310ml

    Resistant against bacteria including E. Coli, MRSA and Salmonella, this Sanitary Silicone Sealant is suitable for use in areas where hygiene is important. It also offers excellent adhesive properties allowing it to be used on most types of non-porous...
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    Geocel Trade Mate Frame Seal Brown 310ml

    Geocel Trade Mate Frame Seal is a low modulus neutral silicone sealant for external sealing around door and window frames including PVC-U, coated aluminium & painted surfaces.
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    Geocel Trade Mate Frame Seal Clear 310ml

    Geocel Trade Mate Frame Seal is a low modulus neutral silicone sealant for external sealing around door and window frames including PVC-U, coated aluminium & painted surfaces.
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    Geocel Trade Mate Sanitary Sealant Clear 310ml

    Geocel Trade Mate Sanitary Seal is a fast curing silicone sealant, ideal for sealing around sanitary units and non-porous surfaces. It provides excellent unprimed adhesion to a variety of substrates including ceramics, plastics and enamel.
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    Soudal Premium Building Silicone Clear 290ml (128442)

    High quality low modulus neutral cure silicone sealant for glazing construction and industrial sealing. Very fast skinning time and final cure with excellent toolability and primerless adhesion on all common construction materials. High movement...
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    Soudal Premium Building Silicone White 290ml (128440)

    High quality low modulus neutral cure silicone sealant for glazing construction and industrial sealing. Very fast skinning time and final cure with excellent toolability and primerless adhesion on all common construction materials. High movement...
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    Soudal Silirub N Anthracite RAL 7016 UK 300ml (146067)

    General purpose, low modulus, neutral cure silicone sealant that has a very fast skinning time and final cure. Primerless adhesion on most common construction materials. Resistant to UV, rain, snow, making it great for perimeter sealing of window and...
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    Soudal Silirub N Black UK 300ml (122401)

    General purpose, low modulus, neutral cure silicone sealant.Very fast skinning time and final cure. Excellent toolability. Primerless adhesion on most common construction materials. Resistant to UV, rain, snow. Glazing, construction and industrial...
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    Soudal Silirub N Brilliant White UK 300ml (118985)

    General purpose, low modulus, neutral cure silicone sealant.Very fast skinning time and final cure. Excellent toolability. Primerless adhesion on most common construction materials. Resistant to UV, rain, snow. Glazing, construction and industrial...
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    Soudal Stay Fresh Acetoxy Anti-Mould Silicone Clear 290ml (152988)

    The ultimate anti-mould sealant by Soudal is a neutral cure silicone. Contains powerful anti-fungicidal agents. Very fast skinning time and final cure. Thick-bodied. Primerless adhesion on all sanitary materials, including plastics. Highly elastic...
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    Soudal Stay Fresh Acetoxy Anti-Mould Silicone Ice White 290ml (152987)

    The ultimate anti-mould sealant by Soudal is a neutral cure silicone. Contains powerful anti-fungicidal agents. Very fast skinning time and final cure. Thick-bodied. Primerless adhesion on all sanitary materials, including plastics. Highly elastic...
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    Soudal Stay Fresh Anti-Mould Silicone Clear Twin Pack

    Soudal Stay Fresh is a high-quality, neutral, elastic one-component silicone based joint sealant. Primerless adhesion on all sanitary materials, including plastics. Highly elastic. Resistant to UV, rain, snow, High and low temperature resistant.
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    Soudal Stay Fresh Anti-Mould Silicone Ice White Twin Pack

    Soudal Stay Fresh is a high-quality, neutral, elastic one-component silicone based joint sealant. Primerless adhesion on all sanitary materials, including plastics. Highly elastic. Resistant to UV, rain, snow, High and low temperature resistant.

Sealants & Adhesives

Grab adhesives

Ideal for strong, instant bonding without the need for nails or screws:

Perfect for flexible, waterproof sealing:

  • Bathroom sealants
  • Exterior silicone
  • Weatherproof sealants
  • Expanding foam

Used for filling gaps and insulation:

Specialist adhesives & sealants

Designed for specific materials and applications:

  • Wood adhesives
  • Masonry sealants
  • High-temperature sealants

Choosing the right sealant or adhesive

When selecting sealants and adhesives, consider:

  • Application – bonding, sealing, or gap filling
  • Environment – interior or exterior use
  • Water resistance – essential for bathrooms and outdoor areas
  • Material compatibility – wood, metal, masonry, or plastic

Complete your project

You may also need:

If you are working on a new project or renovating an existing outdoor space, pop into your local Howarth branch or browse our website. We also offer Click & Collect and Delivery options.

Shop Sealants & Adhesives by Type

Frequently Asked Questions

How to use silicone sealant?
To use silicone sealant, prepare the area that needs to be sealed, apply the sealant, smooth the sealant, and then leave it to dry.
How much tile adhesive do I need?
You will need 1.8kgs per 1mm depth per m2.
How to mix grout?
To mix grout, add water to the grouting powder in the manufacturer-recommend ratio. Tilt mixing bucket and stir with a grout-mixing knife. Then, adjust grout consistency by adding more powder or water. Let the grout rest for up to 10 minutes before using a grout knife to mix thoroughly once more.
How to use wood filler on a door frame?
To use wood filler on a door frame, start off by scraping out any flaking and splinters of paint from the damaged parts by using a wire brush. Then, it is important to soften or mix the filler as per instructions. It could involve stirring to the point of hardening, kneading until it softens, or mixing different substances until you get a similar colour. At this point, apply the ready filler on a putty knife. You will then scrape it onto the frame’s damaged area. After you’ve done that, allow a reasonable time for the filler to dry.
How to use expanding foam?
To use expanding foam, first clean the area, removing any debris and dirt to ensure there will be no contaminants. Put on disposable gloves to ensure you stay as safe as possible (as expanding foam can burn and will stick to your skin if it gets on you), prepare the can by removing the top and screwing in the applicator nozzle onto the valve, making sure not to use too much. Then, finally, shake the can well and then insert the nozzle into the hole you wish to fill, holding the can upside down for the best application. Make sure to leave the foam to set, which will take between 30 minutes and 12 hours depending on the amount of foam you’ve used. Once the foam has dried, you can cut and sand it down to the desired fit.
What is grab adhesive used for?
Grab adhesive is used for bonding materials quickly without the need for screws or nails.
What sealant is best for waterproofing?
Silicone sealants are commonly used for waterproofing due to their flexibility and resistance to moisture.
Can sealants be used outdoors?
Yes, exterior sealants are designed to withstand weather conditions and provide long-lasting protection.