Looking for the best bathroom sealants to stop leaks and prevent mould? Here are six of our favourites for 2025

Silver caulk gun applying white bathroom sealant to white bathroom sink
(Image credit: Getty Images)
Best bathroom sealants: Quick menu

Yellow gloved hands applying bathroom sealant to white tiles and sink

(Image credit: Getty Images)

1. The list in brief
2. Best overall: UniBond Anti-Mould Sealant
3. Versatile All-rounder: Everbuild Everflex 500
4. Fastest working: Gorilla Mould Resistant Seal
5. Trademan's Choice: Dowsil 785 Sanitary Sealant
6. Best For Mould: Everbuild Forever Clear Sealant
7. Best For Small Bathrooms: 151 Silicone Sealant
8. How to choose
9. How we test

Choosing the best bathroom sealant seems straightforward. It needs to prevent water from seeping into the gaps between your bath, sink, shower, toilet, bathroom furniture and the walls and floors. Without a good sealant in place, water will slowly create havoc, especially in areas that you can’t see.

Jack Woodfield

Jack has worked in journalism for over a decade and was the former News Editor of Homebuilding & Renovating between 2019 until 2023. In his time as News Editor he broke the most relevant and beneficial stories for self builders, extenders and renovators, including the latest news on the construction materials shortage, planning permission and green initiatives. In 2021 he appeared on BBC's The World at One to discuss the government's planning reforms. 

He enjoys testing new tools and gadgets, and having bought his first home in 2013, he has renovated every room and recently finished a garden renovation.

With contributions from