Expert advice
When should bathroom silicone be replaced?
How to recognise worn silicone around baths, basins and showers.
Silicone that is lifting, split or missing may no longer protect the joint as intended. Discolouration alone does not always mean a seal has failed.
Where replacement is needed, cutting out the old bead, cleaning the joint and selecting a suitable new sealant is generally preferable to covering over failed silicone.