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. How to use penetrating epoxy to seal and protect your wooden boat feat. louis sauzedde – duration: 5:20. tips from a shipwright 80,188 views. Boat plans for the 17 more suited for unprotected waters than flat-bottomed boats, the v-bottom version of our popular 17′ motorboat boat design..