No, the plumber's putty is not waterproof. It is a non-hardening sealant that is used to stop leaks in plumbing fixtures and create watertight seals.
Plumber's putty should ideally be used only for short-term sealing applications, as it can gradually degrade over time when exposed to moisture or other liquids. It is not recommended for long-term use, as it may eventually fail and allow water to start leaking through the seal.