The efficacy of different fungicides in acrylate and alkyd paints to protect pine sapwood against mould fungi was studied. The acrylate and alkyd paint systems with and without a preservative dipping treatment prior to painting were also used. Differences in the efficacy of the fungicides to protect the paint film were found. The paint films with isothiazolon and IBPC were resistant against mould fungi but the paint films with propiconazole were susceptible to mould. The mixture of propiconazole and IPBC or propiconazole and isothiazolon performed well even at a low concentration. The dipping treatment alone and some fungicides in the paint films supported even higher mould growth than was observed on untreated wood. The most effective combinations were free from mould growth after 26 weeks at RH 100%. In future, the effect of 26 weeks' natural weathering on mould growth will be assessed and the results of the mould test and natural weathering will be compared. The study is a part of a project CT94-2463 in the AIR programme of DG XII.

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