Bathrooms are exposed to constant moisture, humidity and temperature changes, making them one of the toughest environments for sealants. Using the correct bathroom silicone sealant is essential to prevent mould growth, water ingress and premature failure.

Bathroom and sanitary silicones are specifically formulated to cope with wet conditions, providing long-lasting waterproof protection around baths, showers, sinks and sanitary ware.

Why does black mould form on bathroom sealant?

Bathrooms create the perfect conditions for mould to thrive. Warm temperatures, moisture and limited ventilation allow mould spores to settle on sealant surfaces.

Standard sealants can break down over time, allowing moisture to penetrate behind the seal. Once this happens, mould can grow beneath the surface, making it difficult to clean and eventually leading to seal failure.

Bathroom silicone sealants contain added fungicides that actively inhibit mould and mildew growth, helping maintain a clean, hygienic finish for longer.

Key features of bathroom silicone sealants

1. Waterproof performance
   Bathroom sealants create a watertight seal that prevents moisture from penetrating joints around baths, showers, sinks and tiled areas. This helps protect substrates such as plaster, tile adhesive and timber from water damage.

2. Mould resistance
   Sanitary silicones include mould-resistant additives that reduce black mould growth in high-humidity areas, even with regular exposure to water and steam.

3. Flexibility and movement accommodation
   Bathrooms experience frequent movement due to temperature changes and everyday use. Silicone sealants remain permanently flexible, allowing joints to expand and contract without cracking or pulling away.

4. Strong adhesion
   Bathroom silicone bonds securely to common surfaces including ceramic tiles, porcelain, glass, acrylic and enamel, even in areas with persistent moisture.

5. Resistance to cleaning products
   Bathroom sealants are designed to withstand regular cleaning with soaps, detergents and household disinfectants without degrading or discolouring.

Where to use bathroom silicone sealant

Bath and shower edges
Shower trays and enclosures
Sinks and basins
Toilets and sanitary ware
Tiled wall and floor junctions

Application tips for best results

Ensure all surfaces are completely clean and dry before application
Remove all old sealant and residue before applying new silicone
Allow the sealant to fully cure before exposing it to water
Use adequate ventilation during curing to prevent trapped moisture

Summary

Using a dedicated bathroom silicone sealant is essential for achieving a durable, mould-resistant and waterproof finish. With the right preparation and application, sanitary silicone provides long-term protection and helps keep bathrooms clean, hygienic and looking their best.