Back vinyl bucket seat repair help

Maybe something like this? I've never done the seat backs, but I have successfully welded other cracked/broken plastic parts with a similar kit- depending on type of plastic.
Jounjip Plastic Welding Repair Kit for Bumper, Kayak, Canoe - 2 Tips, 20 Black Plastic Rods, 2 Mesh, 80W Iron, 110V Only - - Amazon.com