This crucial step seals the weave of the fiberglass cloth and provides a smooth, durable surface in preparation for final finishing. In this video, boat builder Bob Emser walks you through the process of applying an epoxy fill coat to a fiberglassed kayak hull. Bob covers everything from mixing and applying the epoxy to sanding between coats for a flawless result. Whether you're a first-time builder or a seasoned pro, this step-by-step guide will help you get a clean, professional look on your kayak. In this video, you'll learn: How to prepare the surface before applying the fill coat Proper epoxy mixing techniques (2:1 ratio by volume) Tools you'll need: sandpaper, foam roller Application tips for a smooth, even coat When and how to add coats (timing, and technique) Troubleshooting runs, sags