Exhibit 99.1

RPM Reports Strong Fourth-Quarter and Year-End Results for Fiscal 2011

MEDINA, OH – July 25, 2011 – RPM International Inc. (NYSE: RPM) today reported double-digit gains in sales, net income and earnings per diluted share for its fiscal 2011 fourth quarter ended May 31, 2011, compared to fourth-quarter 2010 pro-forma results. Prior-year pro-forma results assume that the deconsolidation of RPM’s Specialty Products Holding Corp. (SPHC) and subsidiaries occurred before fiscal 2010. The deconsolidation eliminated approximately $300 million in annual revenues from the company’s industrial segment beginning June 1, 2010.

Fourth-Quarter Results

Net sales, net income and earnings per share for the fourth quarter were all up sharply over prior-year pro-forma results. Net sales grew 10.9% to $981.8 million from a pro-forma $885.6 million in fiscal 2010. Consolidated earnings before interest and taxes (EBIT) increased 10.2% to $119.8 million from a pro-forma $108.7 million a year ago. Net income attributable to RPM stockholders was up 14.8% to $70.2 million from $61.1 million a year ago. Diluted earnings per share improved 14.9% to $0.54 from $0.47 in the fiscal 2010 fourth quarter.

“Our strong fourth-quarter performance reflects the resilience of our operating companies in the face of stiff headwinds generated by escalating raw material costs, continued weakness in the domestic housing market and a commercial construction market that is only gradually recovering from depressed levels,” stated Frank C. Sullivan, chairman and chief executive officer. “Our deliberate strategic balance between industrial and consumer markets once again proved effective in addressing challenging market conditions.”

On an as-reported basis, RPM’s net sales of $981.8 million were up 1.1% from the $971.5 million reported in the fiscal 2010 fourth quarter. Consolidated EBIT grew 16.0% to $119.8 million from $103.3 million in the fiscal 2010 fourth period. Net income attributable to RPM stockholders of $70.2 million was up 16.0% from the $60.5 million earned in the fiscal 2010 fourth quarter, while earnings per diluted share of $0.54 were up 14.9% from $0.47 a year ago.

Fourth-Quarter Segment Sales and Earnings

On a pro-forma basis, industrial segment sales grew 14.4% to $625.9 million in the fiscal 2011 fourth quarter from a pro-forma $547.1 million a year ago. Organic sales improved 12.3%, including 3.9% in foreign exchange translation gains, while acquisition growth added 2.1%. Industrial segment EBIT improved 23.5% to $70.3 million from a pro-forma $56.9 million in the fiscal 2010 fourth quarter.

RPM Reports Improved Fourth-Quarter and Year-End Results for Fiscal 2011

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“Our industrial segment benefited from global expansion in sales of high-performance industrial coatings, polymer flooring systems and maintenance products, while the continuing gradual improvement in commercial construction had a positive impact on our domestic and European businesses serving that market. As a result, sales gains in excess of 10% were recorded for high-performance corrosion control coatings, European sealants, polymer flooring systems, fiberglass reinforced plastic grating and North American roofing products,” Sullivan stated.

Net sales for RPM’s consumer segment, which was largely unaffected by the deconsolidation, grew 5.1% to $355.9 million from a pro-forma $338.6 million in the fiscal 2010 fourth quarter. Organic sales were up 5.2%, including foreign exchange translation gains of 1.2%, while a small divestiture reduced sales by 0.1%. Consumer segment EBIT improved 1.8% to $53.6 million from a pro-forma $52.7 million a year ago.

“While the domestic housing market – both sales of existing homes and new construction – remains weak, our Rust-Oleum business benefited from continued market share gains, along with penetration of entirely new markets,” stated Sullivan. “Our caulks and patch and repair products, along with primer sealers, were more heavily impacted by the weak retail consumer spending environment, and thus experienced flat to slightly down quarter-over-quarter sales.”

Cash Flow and Financial Position

For fiscal 2011, cash from operations was $238.2 million, compared to $203.9 million in fiscal 2010. Capital expenditures during the year were $39.8 million, while depreciation was $52.4 million. Total debt at the end of fiscal 2011 was $1.1 billion, compared to $928.6 million at the end of fiscal 2010. RPM’s net (of cash) debt-to-total capitalization ratio was 34.8%, compared to 39.8% at May 31, 2010, with both at the low end of the company’s historic norms.

On May 27, 2011, RPM sold $150 million in aggregate principal amount of 6.125% notes due October 15, 2019 through underwriters led by Merrill Lynch, Pierce, Fenner & Smith Incorporated and Wells Fargo Securities, LLC. The notes were issued at a premium with an effective yield to maturity of 4.934%. Net proceeds are being used for general corporate purposes, including working capital and acquisitions. The notes are a further issuance of the $300 million aggregate principal amount of 6.125% notes due 2019 that were initially issued on October 9, 2009. Following sale of these notes, 95.8% of the company’s long-term debt was at fixed rates averaging 6.32%.

“Our acquisition pipeline is quite active, and we expect to close a number of attractive deals in fiscal 2012. Our strong cash and liquidity position enables us to aggressively pursue acquisitions, while funding internal investment and a growing cash dividend. At May 31, 2011, liquidity, including cash and long-term committed available credit, stood at $887 million,” Sullivan stated.

RPM Reports Improved Fourth-Quarter and Year-End Results for Fiscal 2011

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Fiscal 2011 Sales and Earnings

On a pro-forma basis, fiscal 2011 net sales, net income and earnings per share increased. Net sales were up 8.5% to $3.38 billion from a pro-forma $3.12 billion in fiscal 2010. Consolidated EBIT increased 10.5% to $344.8 million from a pro-forma $312.1 million in fiscal 2010. Net income attributable to RPM stockholders improved 16.1% to $189.1 million from a pro-forma $162.9 million in fiscal 2010. Diluted earnings per share attributable to RPM stockholders grew 15.1% to $1.45 from a pro-forma $1.26 a year ago.

On an as-reported basis, net sales in fiscal 2011 declined 0.9% to $3.38 billion from the $3.41 billion reported a year ago. Consolidated EBIT was $344.8 million, up 7.7% from the $320.2 million reported in fiscal 2010. Net income attributable to RPM stockholders increased 5.0% to $189.1 million from $180.0 million reported in fiscal 2010. Diluted earnings per share attributable to RPM stockholders improved 4.3% to $1.45 in fiscal 2011 from $1.39 a year ago.

Fiscal-Year Segment Sales and Earnings

Sales for RPM’s industrial segment increased 11.3% to $2.26 billion from a pro-forma $2.03 billion in fiscal 2010. The organic sales increase was 8.4%, including net foreign exchange gains of 0.5%, while acquisition growth added 2.9%. Industrial segment EBIT grew 15.4% to $235.8 million from a pro-forma $204.4 million in fiscal 2010.

“Nearly all of our industrial businesses posted strong sales gains for the year, with double-digit increases in high-performance industrial coatings and North American roofing. High single-digit increases were posted in commercial polymer flooring, concrete admixtures and fiberglass reinforced plastic grating,” stated Sullivan.

Consumer segment sales for fiscal 2011 improved 3.4% to $1.12 billion from a pro-forma $1.08 billion reported last year. Organic sales increased by 3.2%, including net foreign exchange gains of 0.2%, with acquisition growth net of a small divestiture adding 0.2%. Consumer segment EBIT fell 0.9%, to $146.0 million from a pro-forma $147.3 million a year ago.

“Rust-Oleum branded products, including small project paints, automotive aftermarket products, and garage and basement floor coatings, enjoyed solid growth for the year. Modest sales declines were experienced in our other consumer do-it-yourself lines,” Sullivan stated.

Minority Interest in Kemrock Industries and Exports Ltd. Increased

In May 2011, RPM increased its minority interest in Kemrock Industries and Exports Ltd, a fully integrated fiberglass reinforced plastic composites manufacturer with more than $200 million in annual sales that is based in Vadodara, Gujarat State, India. The increase in ownership – from 14.9% to 18.3% – triggered a provision under Indian law requiring RPM to commence a public offer for up to an additional 20% of Kemrock’s outstanding shares. RPM’s ownership of Kemrock may increase further when the required tender offer is completed. Kemrock continues to operate under the leadership of founder and managing director, Kalpesh Patel, and his management team.

RPM Reports Improved Fourth-Quarter and Year-End Results for Fiscal 2011

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Business Outlook

“We see continuing strength in our industrial businesses as we build on the market share gains made in businesses that address the recovering commercial construction market and benefit from ongoing momentum in businesses serving our core industrial maintenance and repair markets. We anticipate industrial sales growth in upper single-digit to low double-digit levels, while expecting more modest growth rates in our consumer segment. As a result, we anticipate overall sales growth of 8% to 10%, with 10% to 15% growth in diluted earnings per share. Although we remain challenged by both price and availability of raw materials, along with unsettled economic conditions in both Europe and North America, we are confident that our strategically balanced portfolio of businesses will enable us to achieve these targets,” Sullivan stated.

Webcast and Conference Call Information

Management will host a conference call to further discuss these results beginning at 10:00 a.m. EDT today. The call can be accessed by dialing 800-901-5241 or 617-786-2963 for international callers. Participants are asked to call the assigned number approximately 10 minutes before the conference call begins. The call, which will last approximately one hour, will be open to the public, but only financial analysts will be permitted to ask questions. The media and all other participants will be in a listen-only mode.

For those unable to listen to the live call, a replay will be available from approximately 1:00 p.m. EDT on July 25, 2011 until 11:59 p.m. EDT on August 1, 2011. The replay can be accessed by dialing 888-286-8010 or 617-801-6888 for international callers. The access code is 78868138. The call also will be available both live and for replay, and as a written transcript, via the RPM web site at www.rpminc.com.

About RPM

RPM International Inc., a holding company, owns subsidiaries that are world leaders in specialty coatings, sealants, building materials and related services serving both industrial and consumer markets. RPM’s industrial products include roofing systems, sealants, corrosion control coatings, flooring coatings and specialty chemicals. Industrial brands include Stonhard, Tremco, illbruck, Carboline, Flowcrete, Universal Sealants and Euco. RPM’s consumer products are used by professionals and do-it-yourselfers for home maintenance and improvement and by hobbyists. Consumer brands include Zinsser, Rust-Oleum, DAP, Varathane and Testors. Additional details are available at www.rpminc.com.

For more information, contact Robert L. Matejka, senior vice president and chief financial officer, at 330-273-5090 or rmatejka@rpminc.com.

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This press release contains “forward-looking statements” relating to our business. These forward-looking statements, or other statements made by us, are made based on our expectations and beliefs concerning future events impacting us, and are subject to uncertainties and

RPM Reports Improved Fourth-Quarter and Year-End Results for Fiscal 2011

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factors (including those specified below) which are difficult to predict and, in many instances, are beyond our control. As a result, our actual results could differ materially from those expressed in or implied by any such forward-looking statements. These uncertainties and factors include (a) global markets and general economic conditions, including uncertainties surrounding the volatility in financial markets, the availability of capital and the effect of changes in interest rates, and the viability of banks and other financial institutions; (b) the prices, supply and capacity of raw materials, including assorted pigments, resins, solvents and other natural gas- and oil-based materials; packaging, including plastic containers; and transportation services, including fuel surcharges; (c) continued growth in demand for our products; (d) legal, environmental and litigation risks inherent in our construction and chemicals businesses and risks related to the adequacy of our insurance coverage for such matters; (e) the effect of changes in interest rates; (f) the effect of fluctuations in currency exchange rates upon our foreign operations; (g) the effect of non-currency risks of investing in and conducting operations in foreign countries, including those relating to domestic and international political, social, economic and regulatory factors; (h) risks and uncertainties associated with our ongoing acquisition and divestiture activities; (i) risks related to the adequacy of our contingent liability reserves; (j) risks and uncertainties associated with the SPHC bankruptcy proceedings; and (k) other risks detailed in our filings with the Securities and Exchange Commission, including the risk factors set forth in our Annual Report on Form 10-K for the year ended May 31, 2010, as the same may be updated from time to time. We do not undertake any obligation to publicly update or revise any forward-looking statements to reflect future events, information or circumstances that arise after the date of this release.

CONSOLIDATED STATEMENTS OF INCOME

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SUPPLEMENTAL SEGMENT INFORMATION

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