Coverage Guideline: 3.5 ounces should cover 1-sq. ft. of patch (both surfaces), with 3 thin coats. You can use Clifton Hypalon Adhesive to bond Hypalon to Hypalon, but this adhesive may also be used to bond rubber to rubber. 4oz. Shelf life: 1 year Clifton Hypalon Adhesive Gluing Instructions