Fiberglass helps keep the hull from flexing too much. It's well worth the hassle. I typically only glass seams and joints inside the hull (small scraps) and the bottom. I use resin only on the top - no cloth. It saves weight a bit and doesn't (hasn't so far anyway) sacrificed strength. Only do one layer of cloth. Just build up a couple 2-3 coats of resin on top of the cloth. 3 coats if you're thinning your resin (similar viscosity to polyurethane finish) or 2 coats if using a finishing resin straight up. On the bottom after final curing and ready for final assembly - sand the bottom with 240-400 grit sandpaper. It should help speed the boat up overall.
Last edited by 1QwkSport2.5r; 03-14-2017 at 12:18 AM.