Why PVC? Speed of Repair. Glue, Stick, Raft. No Waiting Around For A Day while The Patch Cures. Sources: PVC, Hypalon, Neoprene, Glue, Plastic Welding Tools & Supplies
When You Must Jam That Aditional Rocket Box Int The Chassis, Just Slap On a Chafe Wear Pad to Protect The Air Holding Diaphram. Then, Forget About It.