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Blog Why Hire an SPCO Contractor. To Be on the Safe Side Hire our Professional Painting Contractors The Signatory Painting Contractors Organization SPCO members are commercial industrial and multiresidential painting contractors. General Contractors building owners project managers and property owners depend on SPCO member contractors to expertly prepare and paint surfaces in projects such as buildings schools hospitals bridges barges and ships. SPCO members maintain an OSHA approved Safety Committee to assure maximum safety education and compliance.