OPERATIVE PLASTERS AND CEMENT MASONS INTERNATIONAL ASSOCIATIONOrganized in 1864, the 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. Plaster and concrete are ageless building materials that will not fall out of favor as long as there is a sufficient amount of workers who are skilled in the arts of installation and finishing. These materials are as unforgiving as they are d