The results of a collaborative international test to evaluate the performance of elastomeric polyurethane coatings of wooden test samples exposed in seawater at 13 sites around the world are reported. The samples have been exposed at sites with known infestations by molluscan and/or crustacean wood borers. Performance data for up to 4 years exposure at some sites is presented providing information on the soundness and adherence of the coatings to wood and the degree of surface fouling. To date, all samples coated with polyurethane remain unattacked by marine borers.

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