Muggles' Guide to Harry Potter/Magic/Permanent Sticking Charm

Overview
The Permanent Sticking Charm is used to permanently fasten one object onto another.

Extended Description
Although we are never informed how to perform this charm, we do see its results; and we are led to believe that it is effectively irrevocable.

We first see this charm used, in Harry Potter and the Order of the Phoenix, in the entrance hall of Number 12, Grimmauld Place. Sirius tells Harry that his mother had affixed her portrait to the wall with a Permanent Sticking Charm, and Sirius has been completely unable to remove it.

Sirius Black later tells Harry about the tapestry showing the family tree of the "most Ancient and Honourable House of Black." This tapestry is also affixed to the wall with a Permanent Sticking Charm.

Fred and George threaten to fasten Ron's Prefect badge to his forehead with a Permanent Sticking Charm when he seems unable to decide where to keep it.

In the first chapter of Harry Potter and the Half-Blood Prince, the Muggle Prime Minister recalls his efforts to remove a portrait in a distant corner of his office. From the description of his efforts and how they had failed, we can guess that this portrait, which is a Wizarding portrait used for communications between the Ministry of Magic and the Prime Minister's office, is affixed to the wall of the office with a Permanent Sticking Charm.

Finally, when Harry visits Sirius' room for the first time in Harry Potter and the Deathly Hallows, he finds that many pictures and tokens of Sirius' stay in Gryffindor House had been attached to the walls with Permanent Sticking Charms. One assumes that Sirius had done this to irritate his parents. Perhaps curiously, Regulus' room, similarly decorated with Slytherin memorabilia, is not described as having had that charm used; perhaps Regulus, as he was not rebelling against his parents, did not fear that his decorations would be disturbed.