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Local 18 Plasterers39 Cement Masons39 HOME ABOUT JOIN MEMBERS APPRENTICESHIP CONTRACTORS CONTACT More. Paving the way to your future. OPCMIA Local 18 Local 18 is nonforprofit labor organization that is part of the Operative Plasterers and Cement Masons International Association. For over 150 years the Operative Plasterers39 and Cement Masons39 International Association OPCMIA has represented and trained plasterers and cement masons for the purpose of protecting and promoting the quality of our industry and the livelihood of our members.