Fixings & Adhesives
CT1 Unique Sealant and Construction Adhesive 290ml
Hybrid polymer sealant and adhesive that bonds and seals virtually any material. Works on wet surfaces.
CT1
UniBond Anti-Mould White Silicone Sealant 274g
Silicone sealant with anti-mould protection, waterproof once cured, for kitchen and bathroom sealing around baths, showers, sinks and worktops.
- Anti-mould formula resists black mould growth in wet areas
- Waterproof once cured, for baths, showers and sinks
- Flexible seal that allows for movement
- Touch dry in about 20 minutes, fully cured in 24 hours
- Smooth finish when tooled correctly
- White colour
Overview
UniBond Anti-Mould Silicone is a widely used bathroom and kitchen sealant in the UK. Its built-in fungicide is designed to resist the black mould that grows in wet areas, while the flexible silicone keeps a watertight seal around baths, showers, sinks and worktops once cured.
In-Depth Look
Silicone sealant around baths and showers is a job most homes need sooner or later. Old silicone turns black, peels away and lets water get behind the bath. UniBond Anti-Mould Silicone is designed to slow that down with a built-in fungicide that resists mould growth on the sealant surface.
Anti-Mould Performance
How long the anti-mould protection lasts depends on conditions. Bathrooms with good ventilation and extraction help it last longer, while poorly ventilated, constantly wet areas will challenge any anti-mould sealant. No silicone stays clean forever in a wet room, so regular cleaning and good ventilation help.
Application and Finish
The finish depends mostly on technique. Cut the nozzle at the right angle, run a steady bead and tool it before it skins. Surfaces must be clean, dry and free of old silicone. It is touch dry in about 20 minutes and fully cured in 24 hours, and the seal is waterproof once cured.
Summary
UniBond Anti-Mould Silicone is a mainstream sealant for bathroom and kitchen joints, with a built-in fungicide, a 20 minute touch-dry time and a 24 hour cure.
How It Compares
This UniBond sealant is a white silicone in a 274g cartridge for a sealant gun. It has an anti-mould formulation and is for kitchens and bathrooms, indoors. It is touch dry in about 20 minutes and fully cured in 24 hours. Once cured it is waterproof and flexible.
Silicone suits joints around baths, basins and showers because it stays flexible when the joint moves.
| Option | What it is | What to weigh up |
|---|---|---|
| This anti-mould silicone | White silicone sealant, anti-mould formulation | Allow 24 hours to cure before wetting |
| Acrylic decorators’ caulk | A paintable filler for gaps | Paintable but less flexible |
| Sanitary silicones without anti-mould additives | Silicone for wet rooms without the anti-mould formulation | Check the label for what it is designed to resist |
| Sealant adhesives | A sealant that also bonds | See the CT1 sealant adhesive |
| Sealing strips | A preformed strip for a joint | Different fitting method, so follow its instructions |
Our guide on choosing sealants and adhesives covers the main types. A sealant like this goes around an enclosure such as the Elegant quadrant shower enclosure 900mm.
Common Questions
How long before I can shower? Full cure is 24 hours, so avoid water until then. The sealant is touch dry in about 20 minutes, but that is not the same as cured.
How do I remove old silicone? Cut out the old bead, scrape away what remains, then clean and dry the joint before applying new sealant. Sealant does not hold well to a damp or dirty joint.
Why does silicone go black? Mould grows on the damp film and soap scum that settle on the sealant. Anti-mould sealant is formulated to resist it, but regular cleaning and drying the joint still matter.
Is this sealant waterproof? It is waterproof once cured, and it stays flexible. Keep the joint dry until the cure time has passed.
Follow the instructions on the cartridge.
| Weight | 274g cartridge |
|---|---|
| Colour | White |
| Type | Silicone |
| Anti-Mould | Yes, built-in fungicide |
| Waterproof | Once cured |
| Touch Dry | About 20 minutes |
| Full Cure | 24 hours |
Who It's For
- Plumbers and bathroom fitters sealing around baths, shower trays and sanitaryware
- Kitchen fitters sealing between worktops, splashbacks and sinks
- Homeowners replacing old, discoloured silicone in bathrooms and kitchens
Pros & Cons
Pros
- Anti-mould protection helps keep the sealant clean for longer
- Flexible seal allows for movement around baths and trays
- Widely available and easy to use
Cons
- Anti-mould protection does not last forever, so the seal will need replacing in time
- Needs 24 hours to cure fully
- Cannot be painted over like a decorator's caulk
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Buying Guides
Sizing Tools
Works Well With
Interiors, Kitchens & Bathrooms
ELEGANT 900 x 900mm Quadrant Shower Enclosure Sliding Glass Door
900mm quadrant shower enclosure with 6mm tempered glass, sliding doors, and chrome frame, designed for corner installation in UK bathrooms.
ELEGANT
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