UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported) June 29, 2012

RPM INTERNATIONAL INC.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (330) 273-5090

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

On June 29, 2012, we and certain of our subsidiaries entered into an unsecured syndicated revolving credit facility (the “New Credit Facility”) with the lenders party thereto and PNC Bank, National Association, as administrative agent for the lenders. The New Credit Facility expires on June 29, 2017. The New Credit Facility provides for a five-year $600.0 million revolving credit facility, which includes sublimits for the issuance of swingline loans, which are comparatively short-term loans used for working capital purposes, and letters of credit. The aggregate maximum principal amount of the commitments under the New Credit Facility may be expanded upon our request, subject to certain conditions, to $800.0 million. The New Credit Facility allows for borrowings in U.S. dollars or certain other foreign currencies in an amount (on a U.S. dollar equivalent basis) of up to $600.0 million. In addition to RPM International Inc., each of RPM Enterprises, Inc., RPM Lux Holdco S.ÀR.L., RPOW UK Limited, RPM Europe Holdco B.V., RPM Canada, Tremco illbruck Coatings Limited, RPM Canada Company and Tremco Asia Pacific PTY. Limited is also a borrower under the New Credit Facility. Each such additional borrower is our wholly-owned direct or indirect subsidiary (except for directors’ qualifying shares or nominal equity interests required to be held by someone other than us or our subsidiary under applicable law). The New Credit Facility contemplates that one or more of our other domestic or foreign subsidiaries may become borrowers as well. RPM International Inc. has agreed to guarantee all obligations of subsidiaries that are or become borrowers under the New Credit Facility.

The New Credit Facility is available to refinance existing indebtedness, to finance working capital and capital expenditure needs, and for general corporate purposes.

At our election, loans under the New Credit Facility (other than loans denominated in a currency other than U.S. Dollars) will bear interest at one of the following options: (1) the alternative base rate which is the greatest of (a) the effective prime rate announced by PNC Bank, National Association, (b) a rate per annum that is 0.5% in excess of the effective federal funds rate and (c) a rate per annum that is 1.0% in excess of the daily Eurodollar rate, plus a margin of 0.0% to 0.7% (based on our debt rating); and (2) the Eurodollar rate (or, in the case of swingline loans, the daily LIBOR rate) plus a margin of 0.875% to 1.70% per annum (based on our debt rating). Loans under the New Credit Facility denominated in a currency other than U.S. Dollars will bear interest at the Eurodollar rate plus a margin of 0.875% to 1.70% per annum (based on our debt rating).

The New Credit Facility contains customary covenants, including but not limited to, limitations on our ability, and in certain instances, our subsidiaries’ ability, to incur liens, make certain investments, or sell or transfer assets. Additionally, we may not permit (i) our consolidated leverage ratio to exceed 60% of the sum of our consolidated indebtedness and consolidated stockholders’ equity or (ii) our consolidated interest coverage ratio to be less than 3.5 to 1.0.

Upon the occurrence of certain events of default, our obligations under the New Credit Facility may be accelerated. Such events of default include payment defaults to lenders under the New Credit Facility, covenant defaults, payment defaults (other than under the New Credit Facility), certain ERISA defaults, change of control and other customary defaults.

The lenders under the New Credit Facility and their affiliates have engaged and may engage in commercial and investment banking transactions with us in the ordinary course of business, and also provide or have provided advisory and financial services to us.

The description of the New Credit Facility set forth herein is not complete and is qualified in its entirety by reference to the full text of the New Credit Facility filed as Exhibit 10.1 to this Form 8-K.

As of June 29, 2012, in connection with our entry into the New Credit Facility described above, we terminated our $400.0 million four-year revolving credit agreement with the lenders party thereto and PNC Bank, National Association, as administrative agent. The lenders under the prior credit agreement and their affiliates have engaged and may engage in commercial and investment banking transactions with us in the ordinary course of business, and also provide or have provided advisory and financial services to us.

(d) Exhibits.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: July 6, 2012

Exhibit Index