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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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    Soudal Multi-Purpose Silicone Clear 270ml (121644)

    Acetoxy silicone sealant that cures to form a flexible, durable weathertight seal on many common building surfaces, including glass, metals, wood and ceramic tiles. Suitable for internal and external use on general construction items, masonry,...
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    Soudal Multi-Purpose Silicone Black 270ml (116824)

    Acetoxy silicone sealant that cures to form a flexible, durable weathertight seal on many common building surfaces, including glass, metals, wood and ceramic tiles. Suitable for internal and external use on general construction items, masonry,...
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    Geocel Top Gun Multi-Purpose Clear 290ml

    Geocel Top Gun Multi Purpose Silicone Sealant can be used for a variety of internal and external applications. It has excellent adhesion, gives a watertight seal and remains permanantly flexible.
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    Soudal Lead Sheet Sealant Grey 290ml (116726)

    Low modulus neutral cure silicone that eliminates the need for grouting. Long life. Adhesion to most building materials - all types of lead (BS:EN 12588 (1999) compatible, milled, rolled, sand cast, water-cooled), other metals, brickwork, concrete,...
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    Geocel Top Gun Multi-Purpose Sealant Brown 290ml

    Geocel Top Gun Multi Purpose Silicone Sealant can be used for a variety of internal and external applications. It has excellent adhesion, gives a watertight seal and remains permanantly flexible.
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    Geocel Trade Mate Lead & Gutter Seal Grey 310ml

    Geocel Trade Mate Lead & Gutter Seal is a silicone rubber sealant for the installation and maintenance of gutter systems and downpipes, and pointing joints between lead flashing and brickwork, stone or masonry.
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    Soudal Multi-Purpose Silicone Brown 270ml (116713)

    Acetoxy silicone sealant that cures to form a flexible, durable weathertight seal on many common building surfaces, including glass, metals, wood and ceramic tiles. Suitable for internal and external use on general construction items, masonry,...
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    Geocel Top Gun Multi-Purpose Sealant White 290ml

    Geocel Top Gun Multi Purpose Silicone Sealant can be used for a variety of internal and external applications. It has excellent adhesion, gives a watertight seal and remains permanantly flexible.
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    Soudal Bathroom & Kitchen Sanitary Silicone Clear 290ml (144383)

    Low modulus acetic curing sanitary sealant silicone, that contains a powerful anti-fungicidal agent. This product has very fast skinning time and final cure with primerless adhesion on most common construction materials. It is resistant to UV, rain and...
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    Soudal Multi-Purpose Silicone Brilliant White 270ml (121643)

    Acetoxy silicone sealant that cures to form a flexible, durable weathertight seal on many common building surfaces, including glass, metals, wood and ceramic tiles. Suitable for internal and external use on general construction items, masonry,...
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    Bostik Pro Sealant S41 Window & Door Frame Silicone Brown 310ml

    A brown S41 Neutral Cure Window & Door Frame Silicone by Bostik, is a professional grade neutral cure silicone sealant, developed for sealing window and door frame joints. This silicone sealant is also available in either Anthracite or Clear, so it fits...
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    Bostik Pro Sealant S41 Window & Door Frame Silicone White 310ml

    This silicone sealant by Bostik is the S41 Neutral cure window & door frame silicone, a professional grade neutral cure silicone sealant, developed for sealing window and door frame joints. This sealant is suitable for interior and exterior...
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    Geocel Top Gun Multi-Purpose Sealant Black 290ml

    Geocel Top Gun Multi Purpose Silicone Sealant can be used for a variety of internal and external applications. It has excellent adhesion, gives a watertight seal and remains permanantly flexible.
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    Geocel Trade Mate Sanitary Sealant White 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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    Bostik Pro Sealant S21 Multi Purpose Silicone Clear 310ml

    This Bostik S21 310ml multi purpose Silicone Sealant is a clear coloured 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...
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    Bostik Pro Sealant S30 Acetoxy Sanitary Silicone Clear 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 Clear 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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    Soudal Bathroom & Kitchen Sanitary Silicone White 290ml (144382)

    Low modulus sanitary silicone by Soudal that contains a powerful anti-fungicidal agent. This silicone has a very fast skinning time and final cure, as well as being resistant to UV, rain and snow. Due to its nature it also features a temperature...
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    Bostik Pro Sealant S21 Multi Purpose Silicone Black 310ml

    A professional grade black S21 multi purpose Silicone Sealant. Features 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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    Geocel Dow Corning 785 Sanitary Silicone Sealant White 310ml

    This Sanitary Silicone Sealant from Geocel offers excellent adhesion to non-porous surfaces and is designed to seal areas around sanitary fittings such as toilets, urinals, sinks, baths, showers etc. The sealant is resilient against most types of...
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    Soudal Multi-Purpose Silicone Grey 270ml (131605)

    Acetoxy silicone sealant that cures to form a flexible, durable weathertight seal on many common building surfaces, including glass, metals, wood and ceramic tiles. Suitable for internal and external use on general construction items, masonry,...
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    Bostik Pro Sealant PU91 Polyurethane Sealant for High Movement Joints Black 300ml (30623103)

    Bostik PU91 Black Silicone is engineered for professionals who demand performance in construction projects with high movement. This versatile polyurethane sealant stands out due to its high modulus and elastic properties, enabling it to endure the...
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    Bostik Pro Sealant PU91 Polyurethane Sealant for High Movement Joints Brown 300ml (30623143)

    Bostik PU91 Silicone in Brown colour is engineered for professionals who demand performance in construction projects with high movement. This versatile polyurethane sealant stands out due to its high modulus and elastic properties, enabling it to endure...
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    Bostik Pro Sealant PU91 Polyurethane Sealant for High Movement Joints White 300ml (30623108)

    Bostik PU91 Silicone is engineered for professionals who demand performance in construction projects with high movement. This versatile polyurethane sealant stands out due to its high modulus and elastic properties, enabling it to endure the stresses...

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.