To make your boat waterproof and add strength, or create composite parts, use a combination of reinforcement material and resin in a method called wet layup. At a basic level, it involves using a liquid resin system to saturate a reinforcement material like fiberglass, then applying the saturated material to a prepared surface, such as a boat or mold. Wet layup is used for building and repairing boats, and making composite parts.

In this article, we’ll describe the types of resin and reinforcement fabrics, explain how to calculate the materials you’ll need, and provide steps for completing a project using the wet layup method.