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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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  • ALM%20Grey%20Sealant%203.webp ALM%20Grey%20Sealant%202.webp

    ALM Flashpoint Lead Sealant 310ml Grey

    Flashpoint provides a preferred alternative to the use of mortar as a pointing material for lead-brick and lead-masonry joints. Mortar is unable to expand and contract with lead and masonry during...
  • ALM%20Flexi%20Slate.webp

    ALM Flexi Slate 450mm Pitched Roof Slate

    The flexibility of lead allows the slate base to be dressed to tiles of all profiles, avoiding wind lift or chatter problems. Premium Flexislate bases are cut from BS EN 12588 Code 4 rolled lead...
  • ALM%20Patination%20Oil.webp

    ALM Oil Patination 1L

    In damp conditions, untreated lead sheet will quickly generate a white carbonate layer, which rainfall will frequently transfer to neighbouring slates, tiles or brickwork, causing unsightly stains. ...
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    Azpects EasySeal Back to Black Limestone 1 Litre (2565)

    Restore rich black tones to natural limestone paving. Back to Black Limestone is a penetrating resin that transforms and exaggerates the look of Black Limestone while providing a stain and...
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    Azpects EasySeal BCS Block & Concrete Sealer & Binder 5 Litre (2520)

    Sealer and sand-binder in one. BCS is a water-based, high grade surface sealer & sand binder for block paving & concrete. It provides a wear-resistant coating for concrete & brick surfaces and has...
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    Azpects Easyseal Contract Block & Concrete Sealer 20 Litre (2545)

    A solvent-free sealer and protector producing a low sheen finish in a single application Contact is specifically designed with the professional contractor in mind. It seals and protects all types of...
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    Azpects Easyseal Contract Block & Concrete Sealer 5 Litre (2540)

    A solvent-free sealer and protector producing a low sheen finish in a single application Contact is specifically designed with the professional contractor in mind. It seals and protects all types of...
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    Azpects EasySeal Porcelain Sealer 3 Litre (2590)

    Invisible long-lasting protection. Porcelain Sealer delivers long-lasting protection and helps keep porcelain paving and tiles looking their best. Its professional-grade formula produces an...
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    Azpects EasySeal Sandstone Sealer & Enhancer 5 Litres (2535)

    2-in-1 colour protector for natural sandstone paving. Sandstone Enhancer & Sealer is a professional-grade water-based, non-solvent solution that enriches, boosts, and enhances the natural colour of...
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    Azpects EasySeal Slate & Limestone Enhancer 5 Litre (2560)

    Seal and enhance natural slate and limestone paving. Slate & Limestone is an advanced water-based high-performance sealer using the latest technology to provide a waterproof, breathable, transparent...
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    Azpects EasySeal SSP Stone Sealer & Protector 5 Litre (2510)

    Protects stone from stains and discolouration. SSP is designed to penetrate, seal & protect natural stone and concrete paving. Virtually invisible once applied, it allows the stone to "breathe"...
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    Azpects EasySeal Ultimate Natural Stone & Concrete 3 Litres (2516)

    The toughest and longest-lasting protection. Azpects Ultimate sealer is the best water-based Sealant and Protector available. Ultimate is perfect for natural stoner and concrete paving, garden...
  • Bostik%20Pave%20Seal%205L%2030812235.jpg.jpeg

    Bostik Cementone Resin Based Paveseal 5 Litre (30812235)

    Bostik Pave Seal, also known as Cementone Pave Seal, is a clear, low viscosity, solvent based acrylic solution that penetrates deeply into dry concrete, brick, porous tiles etc. Bostik Pave Seal...
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    Bostik EVO-STIK Sticks Like Waterproof Sealant C20 Clear (30615679)

    The Evo-Stik 'Sticks Like' is an ultra flexible, paintable and mould resistant sealant SMP Polymer type all-weather sealant. Once applied, it cures by absorbing moisture in the air to a flexible...
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    Bostik EVO-STIK Sticks Like Waterproof Sealant C20 White (30613624)

    The Evo-Stik 'Sticks Like' is an ultra flexible, paintable and mould resistant sealant SMP Polymer type all-weather sealant. Once applied, it cures by absorbing moisture in the air to a flexible...
  • Bostik%20Flashband%20Original%20Length%2010m%20-%2030812185%2030812193%2030816347%2030812199%2030812201%2030812229%2030812238%2030812242.jpg.jpeg

    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...
  • Bostik%20Flashband%20Original%20Length%2010m%20-%2030812185%2030812193%2030816347%2030812199%2030812201%2030812229%2030812238%2030812242.jpg.jpeg

    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...
  • BOSTIK%20PRO%20SEALANTS%20-%20FP403%20FIRESEAL%20HYBRID%20290ML%2030623574%2C%2030623576.png

    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...
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    Bostik Pro Sealant FP403 Fire Resistant Hybrid Fireseal Polymer Sealant White 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...
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    Bostik Pro Sealant P26 Weatherproof MS Polymer Black 290ml (30623176)

    This black internal and external sealant by Bostik, is a professional grade black polymer sealant for weatherproofing exterior joints subject to high movement. It is also available in white, so you...
  • BOSTIK%20PRO%20SEALANTS%20-%20PU91%20POLYURETHANE%20300ML%2030623108%2C%2030623103%2C%2030623104%2C%2030623143.png

    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...
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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...
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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...
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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...

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.