Exhibit 5.1




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                          CALFEE, HALTER & GRISWOLD LLP
                                ATTORNEYS AT LAW



May 10, 2004

RPM International Inc.
2628 Pearl Road
P.O. Box 777
Medina, Ohio  44258

         We have acted as counsel for RPM International Inc., a Delaware
corporation (the "Company"), in the preparation of the Registration Statement on
Form S-4 (the "Registration Statement") to be filed with the Securities and
Exchange Commission under the Securities Act of 1933, as amended (the
"Securities Act"), in connection with the Company's offer to exchange all of the
outstanding RPM International Inc. 6.25% Senior Notes due 2013 (the "Initial
Notes") for new 6.25% Senior Notes due 2013 (the "Exchange Notes"). The Initial
Notes were issued under that certain Indenture, dated as of December 9, 2003
(the "Indenture"), between the Company, as issuer, and The Bank of New York, as
trustee (the "Trustee"). The Company issued the Initial Notes pursuant to that
certain Purchase Agreement, dated as of December 4, 2003 (the "Purchase
Agreement"), among the Company, Banc One Capital Markets, Inc., Wachovia Capital
Markets, LLC, J.P. Morgan Securities, Inc., Fifth Third Securities, Inc., Mellon
Financial Markets, LLC and U.S. Bancorp Piper Jaffray Inc. and each of the
Initial Purchasers named in Schedule A to the Purchase Agreement. The Company is
required to file the Registration Statement pursuant to that certain
Registration Rights Agreement, dated December 9, 2003 (the "Registration Rights
Agreement"), among the Company, Banc One Capital Markets, Inc., Wachovia Capital
Markets, LLC, J.P. Morgan Securities, Inc., Fifth Third Securities, Inc., Mellon
Financial Markets, LLC and U.S. Bancorp Piper Jaffray Inc.

         For purposes of this opinion, we have reviewed such documents, records
and instruments as we have deemed necessary or appropriate for the purposes of
this opinion. In such review, we have assumed the due authorization, execution
and delivery of each document by, and the validity, binding nature and
enforceability of each document against, each of the parties thereto (other than
the Company), the genuineness of all signatures, the legal capacity of natural
persons, the conformity to original documents of all documents submitted to us
as copies (whether or not certified and including facsimiles) and the
authenticity of such latter documents and of all documents submitted to us as
originals. We have also assumed that (i) the Registration Statement shall have
become effective under the Securities Act; (ii) the Trustee (a) is duly
organized, validly existing and in good standing under the laws of its
jurisdiction of organization, (b) is duly qualified to engage in the activities
contemplated by the Indenture, (c) is in compliance, generally and with respect
to acting as a trustee under the Indenture, with all applicable laws and
regulations, and (d) has the requisite organizational and legal power and
authority to perform its obligations under the Indenture; and (iii) the
Indenture shall have become duly qualified under the Trust Indenture Act of
1939, as amended.

         Based upon the foregoing, and subject to the further limitations and
qualifications set forth herein, we are of the opinion that:

         The Exchange Notes have been duly authorized by the Company and, when
duly executed, authenticated and delivered upon exchange for the Initial Notes
in accordance with their terms and the terms of the Indenture, will constitute
legally valid and binding obligations of the Company, enforceable

against the Company in accordance with their terms.

         We are attorneys licensed to practice law in the State of Ohio. The
opinions expressed herein are limited solely to the Federal Law of the United
States of America, the laws of the State of Ohio and the General Corporation Law
of the State of Delaware. We express no opinion as to the effect or
applicability of the laws of any other jurisdiction except to the extent
hereinafter set forth. Further, we note that each of the Indenture, the Purchase
Agreement and the Registration Rights Agreement provides that it shall be
governed by the laws of the State of New York. To the extent that the laws of
the State of New York govern the matters as to which the opinions expressed
herein are rendered, you may rely upon our opinions as opinions with respect to
the laws of the State of New York to the extent that such laws are construed and
applied with the same effect as the substantive laws of the State of Ohio. We
express no opinion as to whether the laws of the State of New York are the same
as the laws of the State of Ohio.

         We consent to the filing of this opinion with the Registration
Statement and to the use of our name therein under the caption "Legal Matters."
Such consent, however, is not an admission that we are in the category of
persons whose consent is required under Section 7 of the Act.

                                               Very truly yours,

                                               /s/ Calfee, Halter & Griswold LLP

                                               CALFEE, HALTER & GRISWOLD LLP