Expert advice
Can you silicone over old silicone?
Why a proper cut-out and reseal is often better than applying another layer.
New silicone often struggles to bond reliably to contaminated or ageing silicone. Applying a fresh bead over an old one may hide the problem without solving it.
A cut-out and reseal removes failed material, prepares the joint and creates a cleaner finish. The right preparation matters as much as the final bead.