The results of al long-term marine trial to assess the protective effect of polyurethane coatings on wood samples exposed at different sites around the world are reported. The condition of samples exposed in the sea for up to 88 months was generally sound, although instances of marine borer infestation were reported at two sites. At one site, mechanical damage of a non-biological nature is believed to have breached the polyurethane coating resulting in attack of the underlying wood by teredinids and pholads. At a second site, infestation by sphaeromatids had perforated the coating after 4 years exposure.

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