"My dear old mum, yeah ...We've been trying to get her down for a month but we think she put a Permanent Sticking Charm on the back of the canvas."
-- Sirius Black on his Mum's painting (OP5)
A Permanent Sticking Charm is a spell that magically fastens one thing to another. It is extremely difficult to remove anything fastened with a Permanent Sticking Charm.
See FIXING CHARM
References from the canon
- Both the portrait of Sirius' mother and the tapestry showing the Black family tree were fastened to the wall with Permanent Sticking Charms. As a result, the members of the Order couldn't remove them from the walls (OP6).
- The enchanted portrait in the Prime Minister's office could not be removed from the wall by Muggle means, so it may have a Permanent Sticking Charm on the back (HBP1).
- Used by Sirius Black to put up Muggle posters, Gryffindor banners, and so on in his room at number twelve, Grimmauld Place before he left home (DH10).