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Applying new silicone directly over an old cured bead is usually the wrong starting point for a full sanitary reseal. Remove the old bead and residual film, then inspect the actual bond faces.
Silicone can stop a leaking window only when water has been traced to a failed exterior perimeter joint. Flashing, drainage and window-unit leaks need a different repair.
Use backer rod to control the sealant cavity, prevent three-sided adhesion and support tooling—then verify the backing material and geometry in the exact product documents.
Bathroom silicone can keep getting moldy when the joint stays wet, dries too slowly, has started to fail, or sits beside another water problem. These five checks show you what to look at before cleaning or...
For bathrooms, kitchens, basins, tubs and shower screens, start with sanitary silicone. Consider general-purpose silicone only when its TDS covers the wet-area use, surfaces and exposure.
Neutral cure is not automatically better, and acetoxy cure is not merely the budget option. Use this substrate-first framework to shortlist the right non-structural sealant path and verify the evidence before approval.
