Rated 5 out of 5 by anonymous from castin’ craft resin. clear polyester. i used this as an experiment to see if it could handle weathering .. Epoxy-plus marine epoxy for coating, fiberglassing, stitch & glue – penetrates and seals wood against moisture with a tough, flexible, permanent coating. Intro: making a plywood kayak. the jupiter point series of kayak designs are intended as easy-to-build, fun-to-paddle, versatile collection of kayaks..