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 .. 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.. Fiberglass supply has been providing materials and services to the composite industry and craftsmen since 1982. fiberglass supply carries a full line of composite.