I have tried duct tape and it doesn't have enough flex to stay attached to the vinyl seat...I bought the product below to repair a tear in my seat...follow the directions and it holds great...the tear was close to the seam and this repaired it...not perfect but looks and stays better than duct tape..has been on for 3 months and still sealed tight..bought it on Amazon, but Wal mart also sells..online..
Tear aid vinyl repair