Stitch and glue is a simple boat building method which uses plywood panels stitched together, usually with copper wire, and glued together with epoxy resin.. Hi milos, plywood used for kayak on pictures and videos is a regular one. this same non waterproof plywood is used in doubletrouble too. and for more then a 3 years. If you are going to build a boat, you’ll want one worthy of your investment. read the reviews: best wooden kayak and stitch and glue kit..