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Applying gel coat directly over certain epoxy-based fairing compounds often results in a failure to cure because the base components of the two materials are chemically incompatible.5:14 When this occurs, the gel coat remains tacky and uncured, creating a surface that requires remediation.2:54 A tie coat—typically an epoxy-based barrier coat—can serve as an intermediate layer to bridge the gap between the incompatible fairing compound and the gel coat.6:40 To apply a tie coat, clean the surface with water to remove amine blush, followed by a solvent wipe to ensure no contaminants are sanded into the barrier layer.8:11 While this method offers a potential salvage path for a botched repair, it is not the preferred professional approach.6:55 Starting the project with compatible materials remains the ideal standard.6:59 The attempt to use a barrier coat as a tie coat does not guarantee success, as improper application or specific chemical interactions can still lead to total failure of the finish.9:21

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