25-foot roll of 18-gauge copper wire. perfect for stitch-and-glue boatbuilding.. The stitch and glue. building method for kayaks. has been around since the 60’s. it mainly consists of tying. wooden panels together with. pieces of copper wire. Product description. this soft copper wire is less than 2 mm in diameter making it perfect for stitch and glue boat building. the price is for a 7 metre length that.