Pinus and Eucalyptus L-joints treated with CCA, a water dispersable PCP and untreated ones were painted according to seven different finish's schedules and exposed at two sites in State of Sao Paulo. After ten months of exposure, it was possible to verify that preservative treatment improve the performance of both wood and finish. It was also possible to observe that wood substrate, preservative treatment, kind of finish and site of exposure had a great influence on finishes' surface colonization by both algae and mould fungi.

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