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Aquaseal is a polyurethane sealant which helps to protect the cotton and silk sidewalls of Challenge and Dugast tubular tires. It keeps water from soaking in and damaging the sidewalls, and can help from sidewall abrasions, all without hindering the flex of your tire. In addition the sealant will keep dirt and mud from staining the sidewall.

It has a tubular glue like consistency, and is ideally applied with a finger with a latex glove on hand.