<SEC-DOCUMENT>0001567619-19-023008.txt : 20191212
<SEC-HEADER>0001567619-19-023008.hdr.sgml : 20191212
<ACCEPTANCE-DATETIME>20191212203321
ACCESSION NUMBER:		0001567619-19-023008
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20191210
FILED AS OF DATE:		20191212
DATE AS OF CHANGE:		20191212

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MIHALIK TREVOR I
		CENTRAL INDEX KEY:			0001554221

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-06936
		FILM NUMBER:		191283097

	MAIL ADDRESS:	
		STREET 1:		101 ASH STREET
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92101

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			WD 40 CO
		CENTRAL INDEX KEY:			0000105132
		STANDARD INDUSTRIAL CLASSIFICATION:	MISCELLANEOUS CHEMICAL PRODUCTS [2890]
		IRS NUMBER:				951797918
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0831

	BUSINESS ADDRESS:	
		STREET 1:		9715 BUSINESSPARK AVENUE
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92131
		BUSINESS PHONE:		6192751400

	MAIL ADDRESS:	
		STREET 1:		9715 BUSINESSPARK AVENUE
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92131
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 3
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2019-12-10</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000105132</issuerCik>
        <issuerName>WD 40 CO</issuerName>
        <issuerTradingSymbol>WDFC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001554221</rptOwnerCik>
            <rptOwnerName>MIHALIK TREVOR I</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>9715 BUSINESSPARK AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAN DIEGO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92131</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>938.102</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Total includes 636 Restricted Stock Units (Common Stock equivalents). The reporting person was elected to the Issuer's board of directors on December 10, 2019. In accordance with the Issuer's Directors' Compensation Policy and Election Plan, 636 Restricted Stock Units were granted to the reporting person pursuant to the WD-40 Company 2016 Stock Incentive Plan for non-elective and elective portions of annual director compensation. The Restricted Stock Units will be settled solely with Issuer Common Stock upon termination of the reporting person's service as a director.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Richard T. Clampitt, as attorney-in-fact for Trevor I. Mihalik</signatureName>
        <signatureDate>2019-12-12</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
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<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>poa_mihalik.htm
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  <div>
    <div style="text-align: center; line-height: 12.55pt; font-weight: bold;">POWER OF ATTORNEY</div>
    <div style="line-height: 12.55pt;"><br style="line-height: 12.55pt;">
    </div>
    <div style="text-indent: 36pt; line-height: 12.55pt;">KNOW ALL BY THESE PRESENTS, THAT THE UNDERSIGNED HEREBY CONSTITUTES AND APPOINTS EACH OF<font style="font-weight: bold;"> RICHARD T. CLAMPITT</font> AND <font style="font-weight: bold;">HEIDI L. MODRUSAN</font>, SIGNING SINGLY, THE
      UNDERSIGNED&#8217;S TRUE AND LAWFUL ATTORNEY-IN-FACT TO:</div>
    <div style="line-height: 12.55pt;"><br style="line-height: 12.55pt;">
    </div>
    <div style="text-indent: 36pt; line-height: 12.55pt;">(1)<font id="TRGRRTFtoHTMLTab" style="display: inline-block; text-indent: 0px; font-size: 1px; width: 36pt">&#160;</font>execute for and on behalf of the undersigned, an officer and/or director of WD-40 Company (the &#8220;Company&#8221;), Forms 3, 4 and 5 in accordance with Section
        16(a) of the Securities Exchange Act of 1934 and the rules thereunder;</div>
    <div style="line-height: 12.55pt;"><br style="line-height: 12.55pt;">
    </div>
    <div style="text-indent: 36pt; line-height: 11.9pt;">(2)<font id="TRGRRTFtoHTMLTab" style="display: inline-block; text-indent: 0px; font-size: 1px; width: 36pt">&#160;</font>execute for and on behalf of the undersigned, an officer and/or director of the Company, forms 144 in accordance with Rule 144 promulgated under the
        Securities Act of 1933;</div>
    <div style="line-height: 11.9pt;"><br style="line-height: 11.9pt;">
    </div>
    <div style="text-indent: 36pt; line-height: 11.9pt;">(3)<font id="TRGRRTFtoHTMLTab" style="display: inline-block; text-indent: 0px; font-size: 1px; width: 36pt">&#160;</font>execute for and on behalf of the undersigned, an officer and/or director of the Company, Form ID applications and related documentation in accordance
        with the United States Securities and Exchange Commission Electronic Date Gathering, Analysis, and Retrieval (EDGAR) Filer Management System Requirements;</div>
    <div style="line-height: 11.9pt;"><br style="line-height: 11.9pt;">
    </div>
    <div style="text-indent: 36pt; line-height: 11.9pt;">(4)<font id="TRGRRTFtoHTMLTab" style="display: inline-block; text-indent: 0px; font-size: 1px; width: 36pt">&#160;</font>do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any of the foregoing
        filings and timely file such forms with the United States Securities and Exchange Commission and any stock exchange or similar authority; and</div>
    <div style="line-height: 11.9pt;"><br style="line-height: 11.9pt;">
    </div>
    <div style="text-indent: 36pt; line-height: 11.9pt;">(5)<font id="TRGRRTFtoHTMLTab" style="display: inline-block; text-indent: 0px; font-size: 1px; width: 36pt">&#160;</font>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 such attorney-in-fact&#8216;s discretion.</div>
    <div style="line-height: 11.9pt;"><br style="line-height: 11.9pt;">
    </div>
    <div style="text-indent: 34.05pt; line-height: 11.9pt;">The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and
      every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned 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 such attorney-in-fact&#8217;s 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 the Company assuming, any of the undersigned&#8217;s responsibilities to comply with
      Section 16 of the Securities Exchange Act of 1934 or Rule 144 promulgated under the Securities Act of 1933.</div>
    <div style="line-height: 11.9pt;"><br style="line-height: 11.9pt;">
    </div>
    <div style="text-indent: 34.05pt; line-height: 11.9pt;">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 or Forms 144 with respect to the undersigned&#8217;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. The Power of
      Attorney revokes any and all previous Powers of Attorney of the undersigned.</div>
    <div style="line-height: 11.9pt;"><br style="line-height: 11.9pt;">
    </div>
    <div style="text-indent: 34.05pt; line-height: 11.9pt;">IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 4th day of
      December, 2019.</div>
    <div style="line-height: 12.55pt;"><br style="line-height: 12.55pt;">
    </div>
    <div style="line-height: 12.55pt;"><u>/s/ TREVOR I. MIHALIK</u><font id="TRGRRTFtoHTMLTab" style="display: inline-block; text-indent: 0px; font-size: 1px; width: 216pt">&#160;</font><font id="TRGRRTFtoHTMLTab" style="display: inline-block; text-indent: 0px; font-size: 1px; width: 72pt">&#160;</font>WITNESS:<font id="TRGRRTFtoHTMLTab" style="display: inline-block; text-indent: 0px; font-size: 1px; width: 108pt">&#160;</font><u>/s/ SYLVIA CASTRO-RODRIGUEZ</u></div>
    <div style="line-height: 12.55pt;">Signature<font id="TRGRRTFtoHTMLTab" style="display: inline-block; text-indent: 0px; font-size: 1px; width: 324pt">&#160;</font>Signature</div>
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    <div style="line-height: 12.55pt;"><u>&#160;&#160;Trevor I. Mihalik</u><font id="TRGRRTFtoHTMLTab" style="display: inline-block; text-indent: 0px; font-size: 1px; width: 216pt">&#160;</font><font id="TRGRRTFtoHTMLTab" style="display: inline-block; text-indent: 0px; font-size: 1px; width: 144pt">&#160;</font><u> Sylvia Castro-Rodriquez</u>__________</div>
    <div style="line-height: 12.55pt;">Print Name<font id="TRGRRTFtoHTMLTab" style="display: inline-block; text-indent: 0px; font-size: 1px; width: 324pt">&#160;</font>Print Name</div>
    <div style="line-height: 12.55pt;"><br style="line-height: 12.55pt;">
    </div>
    <div style="text-indent: 288pt; line-height: 12.55pt;"><u>December 4, 2019</u>________________</div>
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    <div style="line-height: 12.55pt;"><font id="TRGRRTFtoHTMLTab" style="display: inline-block; text-indent: 0px; font-size: 1px; width: 288pt">&#160;</font>Date</div>
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