I believe you are correct that the term is sealing… my search fu sucks but I know it has been in one of the ask the mormon type threads about a year ago …
Yeah, but my point is that “Surrender Dorothy” was a single piece of grafitti in a single place. “Kilroy was here” is only famous because it appeared in so many places. Similarly, ‘Cool “Disco” Dan’ is only so famous because it appeared in so many places. I don’t know of any other case than “Surrender Dorothy” where a single piece of grafitti, not an entire class of grafitti, has its own Wikipedia entry.