Basically, stitch and glue boats are constructed by gluing panels of plywood together using epoxy resin and fiberglass. the stitching is used to hold the panels in. You can’t build a stitch-and-glue boat without epoxy fillets. an epoxy fillet (pronounced "fill-it," as in "fill that corner up," not fill-lay, as in "filet of fish. Stitch-and-glue: watch step-by-step videos of a stitch and glue kayak being built. all of our boat kits are built using stitch-and-glue construction..