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DIY Sealants

DIY Sealants
  • MAPESIL AC – Internal Silicone Sealants – All Colours


    MAPESIL AC is a high quality, mould resistant sealant, which is ideal for internal use but can also be used in external applications. The product comes in a 310ml cartridge & has a range of 42 colours to choose from. Mapei also colour match this product to their Ultracolor plus grout range, creating a seamless transition between grout & silicone lines when used together.

    To view the Ultracolor plus range – please click here.


    – Perfect for sealing sanitary areas
    – Kitchens
    – Bathrooms
    – Internal Application
    – Ideal for use with ceramics
    – Can be used on wooden frames
    – Can also be used for Expansion Joints


    – Mapesil AC should not be used in applications between joints of ceramic tiles & natural stone of light colour externally. Use Mapesil LM, which can be viewed here.
    – Should not be used for sealing of surfaces sensitive to acids, such as limestone. Again, use Mapesil LM.
    – Do not use on bituminous surfaces or highly plasticized material.
    – Mapesil AC’s chemical resistance to agents is typically excellent. However, we advise you to check the technical data sheet or do a small test.


    All areas needing application must be solid, free from dust and loose particles, oils, grease, wax, old paint and rust. To guarantee the seal can carry out its function, provision should be made for it to compress freely.

    During application, it is, therefore, necessary that:

    – Mapei AC only adheres to the side of the walls of the joint and not to be used at the base of the joint;
    – The estimated maximum extension should be no higher than 25% of the initial width (calculated at +20°C). The joint should be sized with this in mind

    – Joint width and depth must follow as below:

    10mm Width = 10mm Depth

    11mm – 20mm Width = 10mm Depth

    20mm or above Width = Half of the width in depth.

    With the Mapesil AC, cut the cartridge at the end of the thread and screw supplied nozzle on. Ensure the nozzle is cut at an angle and dimension to the corresponding joint. Insert the cartridge into the gun and expel the sealant.

    We have a number of tools on our website that would assist with the application of this product. We would recommend using a PC Cox Skeleton Gun to apply & a Bond-it Tooling Kit to aid in providing a professional finish.

    For further information, please visit the Mapei website here.

  • Everbuild 825 – External Sealant


    Everbuild 825 is an LM silicone which is odourless with a neutral cure. 825 adheres to a vast range of porous and non-porous surfaces without priming.


    – Perimeter pointing in and outdoors, around PVC, wood and aluminium.

    – Sealing adhesive on PVC and plastic trims.

    – Can be used on soft metals such as lead, copper and zinc.

    – Weather joint sealing to pre-formed panels. Also suitable for use on curtain walling, sealing glazing and draught proofing.

    – Can be used for sealing glass on glass and glass on aluminium. Parapet and roof weather sealing.

    – As an expansion joint sealant.

    – Sealing of insulated glass.


    – Slow skinning time provides excellent tooling. Ideal for large scale construction and glazing.

    – Excellent adhesion to most common surfaces. Eg., glass, metals, plastics, painted/unpainted wood, as well as PVC and polycarbonate.

    – External weathering properties, guaranteeing many years of exposure.

    – High viscosity formula meaning it will hold it’s structure & body on even large joints.



    825 doesn’t require the use of a primer, however a patch test is recommended before full-scale application to be safe. 


    Surfaces must be clean and dust free. 


    – Do not use with bitumen asphalt, neoprene or specific organic elastomers

    – Not to be used in the construction of Aquariums, or any submerged areas.

    – Do not use on substrates that bleed oil, solvents or plasticisers.

    – Cannot be painted over after curing.

    For further information on all Everbuild products, please visit their website here

  • Everbuild Stixall 290ml


    Everbuild Stixall is a solvent-free hybrid of silicone and polyurethane technologies combined to create a high strength sealant adhesive. Stixall was designed for adhering most common building surfaces to each other.


    Stixall can be used for sealing and bonding in a wide range of areas; the following are just some examples:

    – As a grab adhesive for things like nail replacement, even on damp surfaces.
    – For pointing around perimeters such as doors and windows.
    – Adhering mirrors to most common surfaces.
    – Automotive gap filling and sealing, especially in mobile structures.
    – Marine gap filling and sealing, ideal for boats.
    – Jointing cladding panels.
    – Stixall can be used for durable sealing and bonding of joints.
    – As a standard sealant.


    – Initial grab of high strength, no slip & gap filling properties.
    – High bonding strength.
    – For internal or external use.
    – Can be applied to wet surfaces.
    – Waterproof & weatherproof.
    – Quick curing.
    – Can be painted if required (with water-based paints – test an inconspicuous area before use).
    – Solvent-free.
    – Resistant to temperature extremes -40°C to +100°C.
    – Resistant to chemicals & petrol (10% dilute acids/alkali, most solvents).
    – Excellent resistance to UV radiation.

    Furthermore, Everbuild Stixall has a maximum shrinkage of < 2%.

    Also, Everbuild Stixall has excellent, primer-less adhesion to most surfaces, including metals, most plastics, glass, concrete, plaster, plasterboard, polyester, perspex, glass, wood, enamel, painted surfaces etc.

    This product can be used as an alternative to CT1.




  • Dowsil 786 Food Safe Silicone Sealant



    DOWSIL 786 is one part, flexible; fast curing silicone rubber sealant specifically designed for the sealing of refrigeration units and areas where contact with food is likely. Therefore making it ideal for food


    Surface Preparation

    Ensure that surfaces to be sealed are clean, dry, sound and grease-free. Clean with DOWSIL R40 Universal Cleaner or methylated spirits depending on the substrates to be sealed, and dry thoroughly with a clean, lint-free cloth before application of sealant.

    Note: When using any solvent, always provide adequate ventilation. Avoid heat, sparks and open flames. Observe and follow all precautions listed on the solvent container label. Above all, it is recommended that DOWSIL 786 is not applied to surfaces that are below 5°C.


    Areas adjacent to the joints should be masked with tape to prevent contamination of the substrates and to ensure a neat sealant line. After that, masking tape should be removed immediately after tooling.


    Primer is not required on most common nonporous substrates, including vitreous enamel, ceramics, porcelain, glazed tiles, etc. However, for some metals and plastics, priming is required. For more information, please refer to the technical data sheet attached or contact Dow Corning.

    Back-Up Materials

    Where back-up material is required closed cell polyethene backer rod is recommended. Low tack polyethene tape should be used in joints too shallow to allow the use of the backer rod.


    The joint should be tooled within 5 minutes of application to ensure good contact between the sealant and the substrate. Tooling of the sealant also gives a smooth, professional finish.


    The excess sealant may be cleaned off tools and non-porous surfaces while in an uncured state using DOWSIL R40 Universal Cleaner. The cured sealant may be removed with the aid of
    DOWSIL Silicone Sealant Remover, abrasion or other mechanical means. However, care should be taken not to damage plastic surfaces.


    DOWSIL 786 Silicone Sealant should not be applied to porous surfaces such as stone or concrete, or to easily corroded metals such as lead or copper. DOWSIL 786 should
    not be used against surfaces that bleed oils, plasticisers or solvents. Also, contact Geocel’s Technical Services Department for further advice on specific applications.


    For more information, head over to the Dowsil website.

    For application guns, click here, and for a wider range of colours, why not try the Forever White range.

  • Soudal Soudafoam Gun Gap Filler 750ml


    Soudal Soudafoam Gap Filler is an expanding foam filler. Soudal Soudafoam Gap filling formulation with high 3D expansion. Easy to use, one component. Rapid curing. Excellent thermal and acoustic insulation properties. Primerless adhesion on most construction materials. Available in Hand-Held and Genius Gun®, Gun Grade and Click & Fix® versions both come with DuraValave.

    – Excellent stability (no shrinkage or post-expansion)
    – High filling capacity
    – Excellent adhesion on all surfaces (except PE, PP and PTFE).
    – High insulation value, thermal and acoustic
    – Excellent bonding properties.


    For all other foam systems on our website, please click here. for more in our Soudal range, click here.

    For any further info you may need on Soudal products, please visit their website here.

  • Everbuild Roof and Gutter Sealant


    Everbuild Roof and Gutter Sealant is a quality sealant. It provides instant and permanent weather-proofing to a wide variety of applications. Adheres to most roofing materials such as bitumen, asphalt, felt, metals and wood.


    – Fills and seals gaps or cracks in a number of roofing applications.
    – Bonds to roofing felt, lead, zinc & steel.
    – For fixing tiles, slates and flashing into position.
    – Joint sealing on gutters and downpipes.
    – Sticking down loose roofing felt.


    – Incorporates polymer additives to improve adhesion
    – Can be applied in wet conditions.
    – Remains permanently plastic beneath surface skin.
    – Excellent gap filling properties without shrinkage.
    – Excellent external weathering properties



    All surfaces must be clean and free from dust, grease and other contaminants. Furthermore, new concrete or mortar should be allowed adequate time to dry. May be applied to wet surfaces.


    For joints that lap over, apply a sufficient amount of sealant to bridge the gap and press surfaces together while product is still tacky. Cut the tip of the cartridge with a sharp blade, making sure not to damage the thread. Apply using a standard sealant gun. An improved joint appearance can be achieved by applying masking tape to either side of the joint, removing after 5 minutes from application.


    Clean tools in turps or white spirits.


    – Do not use on glass, use Everbuild 996 as a glass to glass sealant
    – Can not be used on white upvc, use EB25.
    – Do not use internally.
    – Although product forms a surface skin, Everbuild Roof and Gutter Sealant will always be tacky to the touch.
    – Do not use in applications where physical surface contact is likely.
    – Furthermore, do not use in constant water immersion situations.

    For all other Everbuild products on our website, please click here.

    For any further information on any of Everbuilds products, please visit their website here.

  • Dowsil 791 Weatherproof Low Mod Silicone


    Dowsil 791 is a low modulus, alkoxy and odourless silicone sealant. Specifically designed for weather sealing building components where high movement is expected. Dowsil 791 adheres to a huge range of both porous and non-porous materials without any priming.


    – Perimeter pointing both in and outdoors, especially around PVC, wood and aluminium.

    – Sealant and adhesive on PVC and plastic trims.

    – Used for sealing soft metals. For example, lead, copper and zinc.

    – Weather sealing and/or joint sealing on pre-formed panels, as well as on curtain walls and glazing.

    – Glass on glass and glass to aluminium, as well as roof weather sealing.

    – Suitable for sealing expansion joints.

    – Sealing of insulated glass.


    – Excellent slow skinning properties. Therefore, making it a great choice for large scale construction and glazing.

    – Excellent adhesion as it adheres to most common surfaces. For example, glass, metals, plastics and painted/unpainted wood, PVC and polycarbonates.

    – Brilliant external weathering properties, guaranteeing it will survive years worth of exposure.

    – High viscosity non-slump formula. It will hold it’s structure & body on larger joints.



    Dow Corning 791 doesn’t require the use of a primer, although adhesion tests are recommended.


    Ensure the application area is dry and cleanof any contaminants. 


    – Not to be used with bitumen asphalt, neoprene and certain organic elastomers

    – Can not be used in the manufacture of Aquariums, use Aqua mate or CT1

    – Non-overpaintable.

    – Not recommended for use as a mirror adhesive.

    – Do not use on food grade applications

    – Do not use for in and around swimming pools. DC 791 is not suitable for swimming pool areas.

    – Can yellow if exposed to bleach or HCl based brick cleaners while curing.

    For any other Dow Corning products on our website, please click here.

  • CT1 Sealant & Adhesive


    CT1 Sealant and Adhesive

    The One-Stop Product for all Sealing and Bonding

    CT1 is a construction adhesive that will never shrink or crack and can be structured and painted with any type of paint. Unlike other sealants, CT1 can be applied onto wet surfaces, making it ideal for use underwater in marine projects.

    Due to its ability to work with water, it is also the ideal product to seal baths and shower trays, windows, doors, roofing and guttering. CT1 Sealant and Adhesive is extremely versatile and is often used across multiple different projects by tradespeople. Available in a range of colours, simply select from the drop-down menu: Clear, Black, Brown, Grey, White, Silver, Oak and Beige. For a wide range of internal sealant colours please refer to Mapesil AC.

    As an adhesive, CT1 will create a formidable bond between any substrate, for instance, metals, glass, mirror, fibreglass, plastics, and stone, concrete, the list is endless. CT1 is often the first port of call for a tradesperson looking for a reliable construction adhesive. Above all, the adhesive to use for a multitude of applications is CT1, creating a permanent bond that will resist extreme loads, pressure and tensile strain.

    Order online today, discounts available and trade and credit account options via our website.

  • Dowsil 895 High Quality Structural Glazing Sealant


    Dowsil 895 – A neutral curing silicone sealant for structural bonding of metal, glass and other materials. DC 895 can also be used as an adhesive. Cures at room temperature, via the exposure to water vapours.


    Ensure all areas are thoroughly cleaned, removing all dirt and oil/liquids. Ensure that all areas are cleaned with the correct cleaning products.


    Dowsil 895 is a structural glazing sealant and applied at the first stage of manufacturing. This allows the correct time to seal for best performance. 

    Technical Specs

    – 2000 hours of exposure to UV radiation in hot water immersion.

    – 5000 load cycles in tension.

    – Resistance to extreme temperatures, salt spray and cleaning agents

    – 4000 hours exposure to UV radiation 

    For more details, please view the Dow Corning 895 technical datasheet attached.

    For all other Dow Corning products on our website, please click here. For tools, such as sealant guns and sealant finishing, please see our tools section here.

    For any further information, you may need, please visit the Geocel website here.

    Alternative products please see below, options like CT1 are available.

  • Everbuild Everflex 175 Universal Acrylic Sealant


    Everbuild Everflex 175 is a sealant that is acrylic based & suitable for internal and external use. It provides a flexible long lasting seal that adheres to virtually all materials. In addition, Everbuild Everflex 175 can be overpainted.


    – PVCu profile, trim and cladding.
    – Internal sealing around PVCu window and door frames.
    – Sealing cracks and gaps in brickwork, stone and concrete.
    – Gap and crack filler before decorating.
    – Sealing around baths and basins.


    – Permanently flexible
    – Mould resistant.
    – Overpaintable.
    – Easy cleanup.



    All surfaces must be clean and dust free. All flaking or loose surface coatings should be removed as should any old mastic before application. Highly porous substrates should be primed before application with Everbuild PVA bond diluted 1:4 with water.


    Using a sharp stanley blade, cut the tip of the cartridge, taking care not to damage the thread. Apply nozzle and again, cut cleanly at a 45° angle, with the opening being slightly larger than the gap to be sealed. Apply product using a standard sealant gun.


    – Not for use in conjunction with bitumen or asphalt.
    – Do not attempt to abrade when cured.
    – Do not use around shower trays. Use GENERAL PURPOSE SILICONE for greater movement capabilities
    – Overpainting is not necessary.

    Note: this product is flexible. Certain inferior quality paints (especially certain vinyl matts) have very little movement in the dry film. However, it is possible for the dry paint film to crack if the movement is excessive.

    For all other Everbuild products on our website,  please click here.

    Any further information you may need on any Everbuild products, visit their website here.


  • Dowsil 796 PVC-U Wood Aluminium Silicone – Box of 12


    Dowsil 796 is a one-part, PVC-U, Aluminium & Wood Silicone Sealant. It is a low modulus, neutral cure silicone, specifically developed for the sealing of PVC-U, glass, glazed surfaces and brickwork.

    How to use

    Clean all joints of release agents, water repellents, dust, dirt, old sealants and other contaminants which could impair adhesion.

    Nonporous surfaces should be cleaned by wiping with a suitable solvent such as DOWSIL R40 Universal Cleaner on oil and lint-free cloth.

    Preparation Dowsil 796

    Masking areas adjacent to the joints should be masked with tape to prevent contamination of the substrates and to ensure a neat sealant line. Masking tape should be removed immediately after tooling.

    Primer is not required for PVC-U or most common construction substrates including brick. A test placement before general use is always recommended.

    To ensure a satisfactory seal, the joint should be tooled down within 5 minutes of application before the curing process takes effect.

    This product should be used in conjunction with a standard-sized silicone or caulking gun.

    Please contact Dowsil’s technical service department if you require further assistance

    For all other Dowsil products on our website, please click.

    For any further information you may need on Dowsil products, please visit the Geocel website here.

  • Everbuild S50 Silicone Sealant


    Everbuild S50 Silicone is a mid-modulus, acetoxy curing silicone sealant that contains a powerful anti-fungal compound to prevent mould and fungal growth in areas of high humidity. Therefore, it gives improved adhesion and flexibility when compared to standard high modulus sanitary grades.


    – Sealing around all types of baths.
    – Sealing around shower trays.
    – Sealing expansion joints and corners of ceramic tiles.
    – Sealing around most sanitary fittings – check the technical datasheet.
    – Sealing in high humidity areas.
    – Used as an adhesive for bath & shower trim.


    – High viscosity formula for quick, easy tooling.
    – Flexible – movement accommodation of +/- 20%.
    – Waterproof seal.
    – Contains a powerful anti-fungal compound to prevent mould growth. Therefore making it ideal for internal sanitary sealing.



    All surfaces must be dry and clan for application of Everbuild S50. Glass and aluminium should be cleaned with a solvent cleaner before application.

    However, some surfaces may require priming. Therefore a small area should be tested first.

    If the joint is likely to be immersed or if adhesion is weak (especially on porous surfaces) use EVERBUILD SILICONE PRIMER P1. Also, to improve adherence (if required) to non-porous surfaces, prime with EVERBUILD SILICONE PRIMER NP2. LIMITATIONS

    – Do not use in conjunction with Bitumen or Asphalt, use Everbuild Weather Mate.
    – Do not use on anodised or chrome plated shower trims, use Everbuild 450.
    – It is the user’s responsibility to determine suitability for use.
    – Not to be used on natural stone, as S50 is not anti leaching and will stain after time.

    We have a number of tools on our website that would assist with the application of this product. We would recommend using a PC Cox Skeleton Gun to apply & a Bond-it Tooling Kit to aid in providing a professional finish.

    Always refer to the technical data sheet or speak to someone at Sealant Supplies for advice.

DIY Sealants

There are many general-purpose silicone and DIY sealants available to help you get the job done right. We stock a wide selection of these sealants for home improvement, workplace application, and general DIY applications.

Silicone sealants are generally versatile in formulation which allows a wide variety of applications. However, some sealants are formulated for specific jobs and it is essential to choose the right product.

At Sealant Supplies Ltd, you can choose from our full catalogue of sealants. We have a wide variety of sealants including roof and gutter sealants, timber sealants, laminate sealants and more. All our sealants come from affordable and reputable brands that you can trust.

We also stock general purpose sealants which are more flexible and suitable for use on smooth, non-porous materials. Their waterproof properties make them ideal for use in showers, sinks, and baths. Some general purpose sealants contain anti-fungal properties which make them a perfect choice for bathrooms and kitchens.

General purpose sealants cure quickly after application providing a high-strength, permanent waterproof seal. This makes them ideal for glass, metal, wood, and plastics among others. General purpose sealants can withstand moisture, heat, and vibration which combined with their low viscosity aids quick application and drying.

Check out our catalogue of DIY silicone sealants to find the solution you need.