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Planning a fiberglass boat repair requires choosing a finishing method—gel coat or paint—before starting any structural work, as this decision dictates the compatible resins and materials.6:58 Using polyester resin for glass layup is cost-effective, but it requires ambient temperatures above 65 degrees Fahrenheit and offers limited working time.8:59 Epoxy provides greater flexibility, as it cures in temperatures as low as 45 degrees Fahrenheit and allows for longer working windows, making it ideal for complex repairs or large surface areas.8:57 When repairing previous work of unknown composition, epoxy is the safer choice because it bonds reliably to both polyester and epoxy substrates.11:41 For a hull restoration intended for a painted finish, a hybrid approach—using polyester resin for initial glass layup and epoxy for fairing—balances cost and performance.12:15 Always identify the intended finish early to avoid material incompatibility and structural failure.6:50

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