|"Are you a wizard or not?"
The title of this article is conjectural. Although it is based on canonical information, the actual name is conjecture and may be supplanted at any time by additional information released from canonical sources. If this occurs, please move this page to the appropriate title.
Sealing magical barriers, such as the one leading to Platform Nine and Three-Quarters
- "He wheeled his trolley forward cautiously until it was right against the barrier and pushed with all his might. The metal remained solid."
- —Harry Potter attempting to access Platform Nine and Three-Quarters[src]
This spell could seal magical barriers and portals of the like commonly used by wizards to limit access to magical locations. In 1992, Dobby used this spell to seal the barrier to Platform Nine and Three-Quarters, preventing Harry Potter and Ronald Weasley from using it, as part of his plot to try to save Harry from the opening of the Chamber of Secrets.