The OPCMIA was founded in 1864 and is a labor union representing the plastering and cement masons trades in the United States and Canada. The goals of the Association are to protect its members from unjust and injurious competition and to protect and promote our crafts' interest through unity of action.
The OPCMIA was founded in 1864 and is a labor union representing the plastering and cement masons trades in the United States and Canada. The goals of the Association are to protect its members from unjust and injurious competition and to protect and promote our crafts' interest through unity of action.