Choose a mould-resistant sanitary silicone or a suitable elastic Fix All product. Check compatibility with natural stone and plastics, and whether the joint will be exposed to water.
- Remove old sealant, mould and other contamination
- Clean and dry the surfaces before applying new sealant
- Allow the sealant to cure fully before exposing it to water
For standing water, active leaks or permanent immersion, choose a product or waterproofing system designed for that exposure.

