Get a Free WD-40 Brand Hat when you sign up for the WD-40 Brand email list. No purchase required. Simply, click this link then click the Sign Up button and fill out the form by Nov. 2, 2018 to be eligible to receive a hat. Be sure to confirm your email to complete your request. Open to U.S. residents only. Valid while supplies last. Shipping of WD-40 Brand Hats will begin on November 15th.