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Osmosis poses a significant challenge in boat maintenance, often caused by water penetrating the gel coat and reacting with the laminate, leading to blistering. This chapter delves into the science behind osmosis, the symptoms of hull damage, and the crucial steps in treatment. It covers initial assessment, stripping the old gel coat, drying out the hull, and the application of new epoxy layers. With a focus on Lloyd's approved standards and best practices for ensuring long-lasting hull integrity and preventing future osmosis issues.