3 Ways to Fix a Cooler That Won’t Seal

Clean the gasket and rim Wipe the rubber gasket and the cooler’s rim with warm soapy water. Dried soda, sand, or grease can break the seal.

Check and adjust the hinges If the lid sits crooked, tighten the screws or add a small washer to shim it back into place. A misaligned hinge is a common cause of poor sealing.

Heat the gasket as a last resort Gently heat the gasket with a hairdryer to soften it, then close the lid and let it cool in that position. If that fails, buy a replacement gasket online—it’s a cheap, twenty-minute fix.