Exhibit 4.6

FOURTH SUPPLEMENTAL INDENTURE

This Fourth Supplemental Indenture (this “Fourth Supplemental Indenture”), dated as of December 13, 2010, among Spectrum Brands, Inc., a Delaware corporation (the “Company”), Seed Resources, L.L.C. (the “Guaranteeing Subsidiary”), and U.S. Bank National Association, a national banking organization organized under the laws of the United States of America, as Trustee (the “Trustee”).

W I T N E S S E T H

WHEREAS, the Company and the Guarantors have heretofore executed and delivered to the Trustee an Indenture, dated as of August 28, 2009, among the Company, the Guarantors and the Trustee, as supplemented by the Supplemental Indenture, dated as of March 15, 2010, the Second Supplemental Indenture, dated as of June 15, 2010 and the Third Supplemental Indenture, dated as of June 16, 2010 (as such may be amended or supplemented from time to time, the “Indenture”), providing for the issuance of an unlimited aggregate principal amount of 12% Senior Subordinated Toggle Notes Due 2019 (the “Notes”);

WHEREAS, on December 3, 2010, pursuant to the terms of the Membership Interest Purchase Agreement, dated as of November 26, 2010, by and among United Pet Group, Inc. (“UPG”), the Guaranteeing Subsidiary, and Frank M. Hoogland, solely in his capacity as the Members’ Representative, UPG purchased all of the membership interests of the Guaranteeing Subsidiary and the Guaranteeing Subsidiary became a wholly-owned subsidiary of UPG;

WHEREAS, Section 4.20 and Section 11.06 of the Indenture provide that under certain circumstances the Company shall cause the Guaranteeing Subsidiary to become a Guarantor by executing and delivering to the Trustee a supplement to the Indenture; and

WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee is authorized to execute and deliver this Fourth Supplemental Indenture.

NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the Company, the Guaranteeing Subsidiary and the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows:

1. Capitalized Terms. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture.

2. Agreement to Guarantee. The Guaranteeing Subsidiary hereby agrees as follows:

(a) Along with all other Guarantors, to jointly and severally Guarantee to each Holder of a Note authenticated and delivered by the Trustee and

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to the Trustee and its successors and assigns, irrespective of the validity and enforceability of the Indenture, the Notes or the obligations of the Company hereunder or thereunder, that:

(b) The obligations hereunder shall be unconditional, irrespective of the validity, regularity or enforceability of the Notes or the Indenture, the absence of any action to enforce the same, any waiver or consent by any Holder of the Notes with respect to any provisions hereof or thereof, the recovery of any judgment against the Company, any action to enforce the same or any other circumstance that might otherwise constitute a legal or equitable discharge or defense of a guarantor.

(c) Subject to Section 6.06 of the Indenture and to the extent permitted by applicable law, each Guarantor hereby waives: diligence presentment, demand of payment, filing of claims with a court in the event of insolvency or bankruptcy of the Company, any right to require a proceeding first against the Company, protest, notice and all demands whatsoever.

(d) Subject to Section 6.06 of the Indenture and to the extent permitted by applicable law, this Note Guarantee shall not be discharged except by complete performance of the obligations contained in the Notes and the Indenture.

(e) If any Holder or the Trustee is required by any court or otherwise to return to the Company, the Guarantors, or any custodian, trustee, liquidator or other similar official acting in relation to either the Company or the Guarantors, any amount paid by either to the Trustee or such Holder, this Note Guarantee, to the extent theretofore discharged, shall be reinstated in full force and effect.

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(f) The Guaranteeing Subsidiary shall not be entitled to any right of subrogation in relation to the Holders in respect of any obligations guaranteed hereby until payment in full of all obligations guaranteed hereby.

(g) As between the Guarantors, on the one hand, and the Holders and the Trustee, on the other hand, (x) the maturity of the obligations guaranteed hereby may be accelerated as provided in Article VI of the Indenture for the purposes of this Note Guarantee, notwithstanding any stay, injunction or other prohibition preventing such acceleration in respect of the obligations guaranteed hereby, and (y) in the event of any declaration of acceleration of such obligations as provided in Article VI of the Indenture, such obligations (whether or not due and payable) shall forthwith become due and payable by the Guarantors for the purpose of this Note Guarantee.

(h) The Guarantors shall have the right to seek contribution from any non-paying Guarantor so long as the exercise of such right does not impair the rights of the Holders under the Note Guarantee.

(j) Pursuant to Section 11.03 of the Indenture, after giving effect to any maximum amount and any other contingent and fixed liabilities of the Guarantor that are relevant under any applicable Bankruptcy Law, the Uniform Fraudulent Conveyance Act, the Uniform Fraudulent Transfer Act or any similar federal or state law to the extent applicable, and after giving effect to any collections from, rights to receive contribution from or payments made by or on behalf of any other Guarantor in respect of the obligations of such other Guarantor under Article XI of the Indenture, the Trustee, the Holders and the Guarantor irrevocably agree that the obligation of such Guarantor shall result in the obligations of such Guarantor under its Note Guarantee not constituting a fraudulent transfer or conveyance.

3. Subordination. The Obligations of the Guaranteeing Subsidiary under its Note Guarantee pursuant to this Fourth Supplemental Indenture shall be subordinated to the Senior Debt of such Guaranteeing Subsidiary on the same basis as the Notes are subordinated to the Senior Debt of the Company. For the purposes of the foregoing sentence, the Trustee and the Holders shall have the right to receive and/or retain payments by such Guaranteeing Subsidiary only at such time as they may receive and/or retain payments in respect of the Notes pursuant to the Indenture, including Article X thereof.

4. Execution and Delivery. The Guaranteeing Subsidiary agrees that the Note Guarantees shall remain in full force and effect notwithstanding any failure to endorse on each Note a notation of such Note Guarantee.

5. Releases. Any Guarantor shall be released and relieved of any obligations under its Note Guarantee as provided in Section 11.05 of the Indenture.

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6. No Recourse Against Others. No past, present or future director, officer, employee, incorporator, stockholder or agent of the Guaranteeing Subsidiary, as such, shall have any liability for any obligations of the Company or the Guaranteeing Subsidiary under the Notes, any Note Guarantees, the Indenture or this Fourth Supplemental Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder of the Notes by accepting a Note waives and releases all such liability. The waiver and release are part of the consideration for issuance of the Notes.

7. NEW YORK LAW TO GOVERN. THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO CONSTRUE THIS FOURTH SUPPLEMENTAL INDENTURE.

8. Counterparts. The parties may sign any number of copies of this Fourth Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement.

9. Effect of Headings. The Section headings herein are for convenience only and shall not affect the construction hereof.

10. Trustee. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Fourth Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by the Guaranteeing Subsidiary and the Company.

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IN WITNESS WHEREOF, the parties hereto have caused this Fourth Supplemental Indenture to be duly executed and attested, all as of the date first above written.