We investigated resistance of unmodified, DMDHEU modified and oil heat treated uncoated and coated Scots pine wood against blue stain fungi. Both EN 152-1 and the reverse exposure tests showed excellent resistance of DMDHEU and especially of oil heat treated wood against blue staining. It is not needed to add any additional protective coating layers to prevent modified wood from staining. However, alkyd solventborne finishes can play an important protective role against blue stain infestations of unmodified wood. Acrylic waterborne stains, due to their high permeability, exhibit lower efficacy.

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