sealer

Short definition from Wiktionary

Noun

1. 1
   A tool used to seal something.
2. 2
   A person who is employed to seal things.
3. 3
   A person who is employed to seal things: An officer responsible for sealing writs or instruments, stamping weights and measures, etc.
4. 4
   A coating designed to prevent excessive absorption of finish coats into porous surfaces; a coating designed to prevent bleeding.
5. 5
   A goal, shot, point, etc., scored close to fulltime so that it becomes impossible for the losing side to score enough to win.
6. 6
   A person who hunts seals.
7. 7
   A vessel engaged in the business of capturing seals.