Exhibit 31.2

                                                  CERTIFICATIONS

I, Yasmin R. Seyal, certify that:

1.   I have reviewed this quarterly report on Form 10-Q/A of GenCorp Inc.;

2.   Based on my knowledge, this quarterly report does not contain any untrue
     statement of a material fact or omit to state a material fact necessary to
     make the statements made, in light of the circumstances under which such
     statements were made, not misleading with respect to the period covered by
     this quarterly report;

3.   Based on my knowledge, the financial statements, and other financial
     information included in this quarterly report, fairly present in all
     material respects the financial condition, results of operations and cash
     flows of the registrant as of, and for, the periods presented in this
     quarterly report;

4.   The registrant's other certifying officer and I are responsible for
     establishing and maintaining disclosure controls and procedures (as defined
     in Exchange Act Rules 13a-14 and 15d-14) for the registrant and have:
     a)   Designed such disclosure controls and procedures, or caused such
          disclosure controls and procedures to be designed under our
          supervision, to ensure that material information relating to the
          registrant, including its consolidated subsidiaries, is made known to
          us by others within those entities, particularly during the period in
          which this quarterly report is being prepared;
     b)   Designed such internal control over financial reporting, or caused
          such internal control over financial reporting to be designed under
          our supervision, to provide reasonable assurance regarding the
          reliability of financial reporting and the preparation of financial
          statements for external purposes in accordance with generally accepted
          accounting principles;
     c)   Evaluated the effectiveness of the registrant's disclosure controls
          and procedures as of August 31, 2003 (the "Evaluation Date") and
          presented in this quarterly report our conclusions about the
          effectiveness of the disclosure controls and procedures as of the end
          of the period covered by this quarterly report based on such
          evaluation;

5.   Disclosed in this quarterly report any change in the registrant's internal
     control over financial reporting that occurred during the registrant's most
     recent fiscal quarter that has materially affected, or is reasonably likely
     to materially affect, the registrant's internal control over financial
     reporting;

6.   The registrant's other certifying officer and I have disclosed, based on
     our most recent evaluation, to the registrant's auditors and the audit
     committee of registrant's board of directors (or persons performing the
     equivalent functions):
     a)   All significant deficiencies and material weakness in the design or
          operation of internal control over financial reporting which are
          reasonably likely to adversely affect the registrant's ability to
          record, process, summarize and report financial information; and
     b)   Any fraud, whether or not material, that involves management or other
          employees who have a significant role in the registrant's internal
          control over financial reporting.

                             Date:    October 21, 2003

                             /s/ Yasmin R. Seyal
                             ---------------------------------------------
                             Yasmin R. Seyal
                             Senior Vice President, Chief Financial Officer
                             and Principal Accounting Officer