Diy: can new silicone be added over old?

Diy self-tutoring: the tutor explores the idea of redoing a silicone seal.

When a silicone seal gives up, or likely soon will, it needs to be repaired.

Can you apply new silicone over top an old seal to fill a crack that’s developed, for instance?

The associate at the hardware store tells me no: you can’t add new silicone on top of old. Therefore, to repair a silicone seal, you must remove it, clean and prep the site, then lay down a fresh one.

Source:

www.caulkyourhome.com

diy.stackexchange.com

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.