To use promo codes at The Powder Coat Store, follow these steps: 1. Copy the discount code by clicking the code on the page. 2. Head to The Powder Coat Store's website at thepowdercoatstore.com. 3. Enter the code in the coupon code entry box during checkout. 4. You will see either a confirmation message of your savings or an error if the code did not work. Remember, promo codes are often time-sensitive and may have certain terms and conditions, so it's important to read any fine print associated with the code.