Resistance of acrylate paint systems on different types of pine and spruce sapwood to mould fungi was studied. Dipping into the preservative prior to painting, a primer with and without a fungicide (propiconazole + IPBC 0.50 + 0.2%) and a topcoat with and without a fungicide (propiconazole + IPBC 0.25 + 0.12%) were combinations of the treatments studied. The efficacy of the treatment systems varied, but the wood material also affected the ability of the paint systems to resist mould growth on the paint surface. The kiln-dried yellow surfaces of the pine and spruce sapwood were more susceptible to mould growth than the spruce surface sawn 10 mm below the original kiln-dried surface. On the resawn spruce material, the most effective treatments were free from mould growth after 26 weeks at RH 100%. However, the effect was markedly lower on the kiln-dried surfaces of pine and spruce sapwood. The influence of natural weathering on the mould growth will be a next stage of the study. The study is a part of a project CT94-2463 in the AIR programme of DG XII.

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