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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 Contractor Straw Foam 750ml

    Geocel Contractor Gun Foam is a polyurethane foam suitable for gap filling around window & door frames.
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    Soudal Handheld Gap Filler Trade Expanding Foam 750ml (116744)

    Moisture curing, self-expanding polyurethane foam for all general purpose gap filling. This expanding foam by Soudal adheres to all common building materials, and is resistant to water, heat and ageing. Excellent sound and heat insulation values. Can be...
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    Dupont Insta-Stik Straw Applied Multi Purpose Adhesive 750ml

    A more practical solution than bagged dry wall adhesive, this handheld can of Insta-Stik Adhesive applies using a gun and cures in just 3-5 minutes. It doesn't require any preparation and is suitable for bonding insulation board and plasterboard as well...
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    Dupont Insta-Stik Gun Applied Multi Purpose Adhesive 750ml

    Dupont Insta Stik is a polyurethane foam adhesive which can be used to fix plasterboard, insulation board and most common building substrates quickly and easily. There are no tools or mixing required and no bags of heavy dry wall adhesive.
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    Geocel Airblock Flexible Foam Adhesive 750ml

    The Geocel Airblock is a high-performance versatile foam filler that provides a reliable and effective solution for air sealing buildings. This foam can fill gaps and voids in building materials, creating an airtight barrier that helps to improve energy...
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    Geocel Contractor B2 Rated Straw Foam 750ml

    Contractor B2 Rated Foam is a moisture curing polyurethane foam that is ideal for sealing and filling gaps in partitions, sealing through gaps and service trunkings.
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    Soudal B2 Fire Class Trade Expanding Foam 750ml (128449)

    Hand Held Fire Rated one component, rapid curing expanding polyurethane foam filler by Soudal. Excellent thermal and acoustic insulation properties as well as great primerless adhesion on most construction materials. For use in passive fire protection...
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    Soudal Soudafoam Fire Rated High Yield Gun Grade Pink 750ml (153085)

    A high yield fire rated, one component expanding polyurethane foam filler. 25% more yield than standard Soudafoam FR fire resisting foam. Excellent thermal and acoustic insulation properties. This rapid curing foam filler expands 35-40 times its initial...

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.