Wooden blocks of spruce were painted with different paint formulations. Water- and solvent-borne model and commercial paints were used. The painted wooden blocks were inoculated with a spore suspension of Aureobasidium pullulans (de Bary) Berkg. and placed in an environment of high humidity for 14 months. Different colonisation and growth patterns were observed on the different paint surfaces. The susceptibility to staining and/or degradation of tested painted wood blocks are discussed. The commercial paints with and without a fungicide became heavily stained. Model paints were not as susceptible to blue stain as the commercial paints tested. Estimation of degree of staining was done with digital image analysis. Further observations were done with a stereo microscope and scanning electron microscopy.

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