UniBond Anti-Mould White Silicone Sealant 274g

UniBond Anti-Mould White Silicone Sealant 274g

By UniBond · Model: 2707184 · Fixings & Adhesives

Waterproof silicone sealant with anti-mould protection for kitchen and bathroom sealing around baths, showers, sinks, and worktops.

  • Anti-mould formula resists black mould growth in wet areas
  • 100% waterproof seal for baths, showers, and sinks
  • Flexible formula accommodates movement without cracking
  • Adheres to ceramic, enamel, glass, PVCu, and most metals
  • Smooth, professional finish when tooled correctly
  • White colour matches most bathroom and kitchen fittings
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Overview

UniBond Anti-Mould Silicone is a widely used bathroom and kitchen sealant across the UK. Its built-in fungicide is designed to resist the black mould that plagues wet areas, while the flexible silicone formula maintains a watertight seal around baths, showers, sinks, and worktops.

In-Depth Look

Silicone sealant around baths and showers is one of those jobs that everyone encounters sooner or later. Old silicone turns black, peels away, and lets water behind the bath. UniBond Anti-Mould Silicone is designed to delay that process with a built-in fungicide that inhibits mould growth on the sealant surface.

Anti-Mould Performance

The fungicide incorporated into the silicone is effective at preventing mould colonisation on the sealant surface for a reasonable period, typically one to three years depending on conditions. Bathrooms with good ventilation and extraction will see longer performance, while poorly ventilated, constantly wet areas will challenge any anti-mould product eventually. It is worth setting realistic expectations: no silicone sealant will stay pristine forever in a wet environment, but this product does extend the time between replacements.

Application and Finish

Like all silicone sealants, the quality of the finish depends largely on application technique. Cutting the nozzle at the right angle, applying a consistent bead, and tooling with a wet finger or profiling tool within the skin time all contribute to a professional result. The acetoxy cure mechanism means a vinegar-like smell during curing, which dissipates within 24 hours. Surfaces must be clean, dry, and free of old silicone for proper adhesion.

Verdict

UniBond Anti-Mould Silicone is a solid, mainstream choice for bathroom and kitchen sealing. The anti-mould protection provides a genuine benefit over standard silicone, and the product is widely available, easy to use, and competitively priced. It will not last forever in a demanding wet environment, but it offers a good balance of performance and value for routine sanitary sealing work.

Specifications
Weight274g cartridge
ColourWhite
TypeAcetoxy cure silicone
Anti-MouldYes, built-in fungicide
Waterproof100% waterproof after cure
Skin TimeApproximately 5-10 minutes
Full Cure24 hours (3mm bead)

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 keeps the sealant looking clean for longer
  • Flexible seal accommodates movement around baths and trays
  • Widely available and easy to use
  • Good adhesion to common bathroom and kitchen materials

Cons

  • Anti-mould protection diminishes over time and eventually needs replacing
  • Acetoxy cure produces a vinegar-like odour during curing
  • Cannot be painted over like a decorator's caulk
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