POWER OF ATTORNEY

         Know all by these presents, that the undersigned hereby constitutes and
appoints each of Cynthia A. Iwasaki and Stephen E. Johnson, signing singly, his
true and lawful attorney-in-fact to:

         (1)      execute for and on behalf of the undersigned Forms 3, 4 or 5
                  and in accordance with Section 16(a) of the Securities
                  Exchange Act of 1934 and the rules thereunder;

         (2)      do and perform any and all acts for and on behalf of the
                  undersigned which may be necessary or desirable to complete
                  the execution of any such Form 3, 4 or 5 and the timely filing
                  of such form with the United States Securities and Exchange
                  Commission and any other authority; and

         (3)      take any other action of any type whatsoever in connection
                  with the foregoing which, in the opinion of such
                  attorney-in-fact, may be of benefit to, in the best interest
                  of, or legally required by, the undersigned, it being
                  understood that the documents executed by such
                  attorney-in-fact on behalf of the undersigned pursuant to this
                  Power of Attorney shall be in such form and shall contain such
                  terms and conditions as such attorney-in-fact may approve in
                  his discretion.

         The undersigned hereby grants to each such attorney-in-fact full power
and authority to do and perform all and every act and thing whatsoever
requisite, necessary and proper to be done in the exercise of any of the rights
and powers herein granted, as fully to all intents and purposes as such
attorney-in-fact might or could do if personally present, with full power of
substitution or revocation, hereby ratifying and confirming all that such
attorney-in-fact, or his substitute or substitutes, shall lawfully do or cause
to be done by virtue of this power of attorney and the rights and powers herein
granted. The undersigned acknowledges that the foregoing attorneys-in-fact, in
serving in such capacity at the request of the undersigned, are not assuming,
nor is Ameron International Corporation a Delaware corporation, (the "Company")
assuming, any of the undersigned's responsibilities to comply with Section 16 of
the Securities Exchange Act of 1934.

This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4, and 5 with respect to the
undersigned's holdings of and transactions in securities issued by the Company,
unless earlier revoked by the undersigned in a signed writing delivered to the
foregoing attorneys-in-fact.

         IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed as of this 29 day of May 2008.

                                    Signature:       /s/ John E. Peppercorn
                                                     ----------------------
                                                     John E. Peppercorn