CT1 is a hybrid polymer sealant and adhesive that bonds and seals in one application. It works on metals, glass, wood, concrete, tiles and more, with no primer needed and no additional fixings required.
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£0.66£0.79
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Colour
Price
Best Price
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Crystal Clear
£12.00£14.40£8.95£10.74
£7.85£9.42
White
£11.00£13.20£7.95£9.54
£6.97£8.36
Black
£11.00£13.20£7.95£9.54
£6.97£8.36
Grey
£11.00£13.20£7.95£9.54
£6.97£8.36
Brown
£11.00£13.20£7.95£9.54
£6.97£8.36
Oak
£11.00£13.20£7.95£9.54
£6.97£8.36
Beige
£11.00£13.20£7.95£9.54
£6.97£8.36
Anthracite
£11.00£13.20£7.95£9.54
£6.97£8.36
CT1 adhesive and sealant is one of those products that earns its place in the van and stays there. Developed as a genuine all-in-one hybrid polymer formula, CT1 bonds and seals across an unusually wide range of materials without needing a separate primer, activator, or mechanical fixing. One tube does both jobs, and does them properly.
The formula is based on TRIBRID technology, which gives CT1 adhesive its flexibility and grip across dissimilar materials. Unlike standard silicone sealants, CT1 does not shrink, crack, or lose adhesion as the substrate moves. It cures to a flexible, waterproof seal that handles both movement and load, which is why it gets used on everything from roofline repairs to bathroom installations to structural bonding jobs.
CT1 bonds well to all metals, including lead. This makes it genuinely useful for roofing work where lead flashing needs bonding or sealing without hot work. It also grips glass, mirrors, all timber types, MDF, fibreglass, polystyrene, concrete, most natural stone (without staining), and most synthetic materials and plastics. The main exceptions are PP, PE, and PTFE — CT1 will not bond to these materials, and there is no point pretending otherwise.
It can be applied to wet or damp surfaces, which matters more than most sealants will admit. On a building site or a roofing job, conditions are rarely ideal. CT1 does not need a dry substrate to achieve a sound bond, which saves time and removes one excuse for the repair failing by next spring.
Where CT1 Sealant and Adhesive Gets Used
Roofers use CT1 for bonding lead flashing, sealing around flashings and upstands, and fixing roof trim without screws. Joiners and site carpenters reach for it when they need a structural bond with built-in flex. Tilers use it as an adhesive and grout substitute around sanitary ware where movement is likely. Plumbers use it to seal around pipework penetrations. Once it is on site, it tends to get used for all sorts of things that nobody planned for — which is either a recommendation or a warning, depending on how you look at it.
Colour Options
CT1 is available in White, Black, Grey, Anthracite, Brown, Beige, Oak, and Crystal Clear, so it can be matched to the substrate or finished surface rather than left as an obvious bead of the wrong colour. Crystal Clear cures transparent, which suits glass applications and anywhere a clean finish matters.
Available individually or in a box of 12, making it straightforward to stock on site or in the van. The box price brings the per-tube cost down noticeably, which adds up when CT1 becomes the go-to sealant for a regular trade.
Pro Tip: When applying CT1 to lead flashing, clean the surface with a solvent wipe first to remove any oxide layer, as this gives a significantly stronger initial bond and helps the cure get started properly.
CT1 sealant and adhesive is used across roofing, joinery, plumbing, tiling, and general construction where a permanent, flexible bond and seal is needed in a single application. It is commonly applied around lead flashing, roof trim, window and door frames, bathroom and kitchen sanitary ware, skirting boards, worktops, tiles, and structural panel bonding. Because CT1 works on wet surfaces and does not require additional fixings, it is practical in outdoor and exposed conditions where other adhesives fall short.
Best For
Bonding and sealing lead flashing
Window and door frame sealing
Bathroom and kitchen installations
Structural panel and board bonding
Roofline and trim fixing
Wet or damp surface applications
Compatible Surfaces
All metals including lead
Glass and mirrors
All timbers and MDF
Polystyrene and fibreglass
Concrete and most natural stone
Most synthetic materials and plastics (excluding PP, PE, PTFE)
Key Properties
Hybrid polymer TRIBRID formula
Bonds and seals in one application
Flexible and waterproof once cured
No primer or activator required
Suitable for wet and damp surfaces
Available in 8 colours including Crystal Clear
No shrinkage or cracking on cure
Not suitable for: CT1 will not bond to PP (polypropylene), PE (polyethylene), or PTFE surfaces. It is not intended as a structural load-bearing adhesive for dynamic or high-stress mechanical joints.
CT1 adhesive is applied directly from a standard 290ml cartridge using a skeleton or sausage gun. No mixing, priming, or pre-treatment is required in most cases, though cleaning greasy or heavily oxidised surfaces beforehand will improve adhesion. The nozzle should be cut to give a bead size appropriate to the joint width.
CT1 skins relatively quickly in normal conditions, so work in manageable sections and tool off any exposed bead promptly if a clean finish is needed. Full cure time depends on joint depth, temperature, and humidity, but surface cure typically occurs within one to two hours. The bond strengthens as it cures fully over 24 to 48 hours.
Ensure surfaces are clean, dry if possible, and free from grease, dust, or loose material.
Cut the nozzle at an angle to produce a bead that matches your joint width.
Load the cartridge into a standard skeleton gun and apply even pressure.
Apply a continuous bead along the joint or bonding line without stopping and starting.
Press the substrate or component firmly into place immediately after application.
Tool off any exposed sealant with a wet finger or spatula within a few minutes for a clean finish.
Allow to surface-cure for one to two hours before disturbing, and leave 24 to 48 hours for full cure before applying load.
Can CT1 be applied to wet surfaces?
Yes. CT1 adhesive is formulated to bond and seal on wet or damp surfaces, which makes it suitable for outdoor repairs and roofing work where dry conditions cannot be guaranteed.
Is CT1 suitable for bonding lead flashing?
CT1 is widely used by roofers for bonding and sealing lead flashing. It grips well to lead without staining or corroding it, and the flexible cure handles the natural movement of lead in temperature changes.
Which plastics will CT1 not bond to?
CT1 will not bond to polypropylene (PP), polyethylene (PE), or PTFE. These low-energy plastics resist adhesion from virtually all standard adhesives. For all other common plastics and synthetics, CT1 typically bonds well.
How long does CT1 take to cure fully?
CT1 typically skins within one to two hours under normal temperature and humidity conditions. A full, loadbearing cure takes approximately 24 to 48 hours depending on joint depth, temperature, and how much air can reach the adhesive.
CT1 is a hybrid polymer sealant and adhesive based on TRIBRID technology, combining the flexibility of silicone, the adhesion of polyurethane, and the paintability of MS polymer in a single solvent-free, isocyanate-free formula. It cures by moisture absorption to produce a permanently flexible, waterproof bond. CT1 is UV stable, resistant to most common chemicals, and does not shrink or crack on cure.
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