St. Louis Cup Insulated Tumbler with Straw Custom Any Name & Number 30 oz Gifts for Men /Women  How To Care For Your Tumbler Did you know that a stainless steel tumbler can rust if not maintained correctly? Or that you can control how long your drink stays hot or cold in an Double Wall Tumbler simply by changing where you store it How To Clean a Stainless Steel Tumbler Hand Washing: We recommend using baking soda (two tablespoons) and white vinegar (two cups). Carefully mix the ingredients into your tumbler and let the mixture foam up and then settle for about five minutes. If the stains aren’t gone after a light scrubbing with a non-metallic brush, rinse and repeat. Please note: Double Wall Tumblers are not dishwasher safe. The lids are dishwasher safe on the top rack, but the tumblers themselves are not. How To Get The Best From Your Tumbler Keeping Drinks Colder, Longer: There’s nothing like a cold drink to refresh you, and there’s one simple trick that can keep your cold drink even colder longer: store your tumbler in the fridge. - The Epoxy I use is KS Resin LIQUID ART ULTRA UV