NEW YORK ( TheStreet) -TheStreet Ratings' stock model upgraded RPM International ( RPM) to 'Buy' from 'Hold'. This $2.5 billion market capitalization building materials company reported fiscal fourth quarter revenue 13.3% more than the year earlier period. TheStreet Ratings released rating changes on 23 additional U.S. common stocks for July 26, 2010. In total, just six stocks were downgraded and 18 stocks have been upgraded by our stock model. Second quarter earnings season bullishness continues to be seen in our stock model results. The net income at RPM International jumped by 54% over the same quarter in the prior fiscal year. The company has made moves and taken charges to resolve asbestos related liabilities of its Specialty Products business. Also being upgraded by TheStreet Ratings' stock model is Vornado Realty Trust ( VNO)climbing to 'Buy' from 'Hold'. This office properties real estate investment trust, or REIT, picked up prime Atlantic City real estate from MGM Resorts connected to Borgata Hotel Casino & Spa that includes a 800 room hotel and convention center. -- Reported by Kevin Baker in Jupiter, Fla. For additional Investment Research check out our Ratings Research Center.