Silicone seals gaps and stays flexible, and is read as patching over cracks and keeping things watertight. It may also stand for something softened or made artificially smooth.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.