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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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    Geocel Trade Mate Roofers Seal Grey 310ml

    Geocel Trade Mate Roofers Seal is a single component, high performance elastomeric sealant and can be used for most roofing applications and repairs. It will adhere to various roofing substrates including, lead, bitumen and galvanised steel. It is ideal...
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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 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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    Bostik Pro Sealant PU91 Construction Polyurethane Grey 300ml (30623104)

    PU91 by Bostik is a professional grade construction polyurethane sealant developed for sealing construction joints subject to high movement. This grey PU sealant has a high modulus formulation and is extremely elastic with up to 25% movement capability...
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    Soudal Express Cement Repair Grey 290ml (125786)

    High speed acrylic polymer based, textured repair cement. For easy and quick reparation or filling of joints and cracks in concrete. Can be applied by trowel or gun. sandable and over-paintable once dried. Can be used for internal and external...

  • Bostik Flashband Self-Adhesive Tape Grey 10m x 300mm (30812229)

    The Flashband is a self-adhesive flashing tape manufactured by Bostik that bonds instantly to a wide range of building materials, providing a permanent, watertight seal in all climates. The flexible bitumen flashing tape is compatible with brick,...
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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 Flashband Self-Adhesive Tape Grey 10m x 100mm (30816347)

    The Flashband is a self-adhesive flashing tape manufactured by Bostik that bonds instantly to a wide range of building materials, providing a permanent, watertight seal in all climates. The flexible bitumen flashing tape is compatible with brick,...

  • Bostik Flashband Self-Adhesive Tape Grey 10m x 150mm (30812199)

    The Flashband is a self-adhesive flashing tape manufactured by Bostik that bonds instantly to a wide range of building materials, providing a permanent, watertight seal in all climates. The flexible bitumen flashing tape is compatible with brick,...
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    Bostik Pro Sealant FP403 Fire Resistant Hybrid Fireseal Polymer Sealant Grey 310ml

    The FP403 is a fire resistant polymer sealant by Bostik. This one-component, fire resistant hybrid sealant is suitable for fire resistant sealing of linear joints for up to 4 hours and offers up to 25% movement capability. Fire rated to EN 1366-4, the...
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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...
  • BOSTIK%20PRO%20SEALANTS%20-%20S31%20SILICONE%20310ML%2030623019%2C%2030623018%2C%2030623017.png

    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...

  • Bostik Self Adhesive Flashband Tape Grey 10m x 225mm (30812201)

    Bostik Flashband Self-Adhesive Flashing Tape for roofs is a self-adhesive sealing bitumen strip, which bonds to provide a strong, watertight seal. It requires no separate adhesive. Bostik Flashband is easily applied using hand pressure and a seam...
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    Bostik Self Adhesive Flashband Tape Grey 10m x 75mm (30812193)

    Bostik Flashband Self-Adhesive Flashing Tape for roofs is a self-adhesive sealing bitumen strip, which bonds to provide a strong, watertight seal. It requires no separate adhesive. Bostik Flashband is easily applied using hand pressure and a seam...
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    Everbuild EB25 Ultimate Sealant & Adhesive Cartridge Grey 300ml EB25GY

    EB25 is the ultimate sealant and adhesive, with excellent flexibility and remarkable bond strength that you can rely on for practically any application, thanks to a unique polymer blend and cutting-edge technology. Suitable for use both indoors and...
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    Soudal Fix All High Tack Grey 290ml (101454)

    Super strong grey coloured hybrid polymer sealant and adhesive with high initial tack and end strength (320kg/10cm²). Based on SMX Polymer Technology, High Tack achieves high performance flexible bonding and sealing of all types of materials onto almost...
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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...

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.