Oil heat-treated (thermally modified) pine wood was coated with 9 different types of solvent- or water-borne exterior finishes. The systems with modified wood substrate as well as unpainted and painted non-modified controls were exposed to weathering (EN 927-3) on two locations with sub-alpine and alpine climate. The influence of natural ageing on surface systems was evaluated after one year of exposure. It was stated that in terms of surface damages (cracking, flaking, mould growth) the coated oil heat-treated wood performed better then the painted non-modified wood. In terms of colour stability, partially pigmented semi-transparent stains gave encouraging results on oil heat-treated wood while the “modified wood – unpigmented transparent coatings” systems performed less satisfactorily.

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