For the determination of the protective effectiveness of a preservative treatment against blue stain in service, artificial weathering has been proposed as an alternative for the natural weathering period of 6 months in the European standard EN 152. Research on a range of products and on complete finishing systems for external joinery was conducted during 1986-1990. It revealed that the decisions drawn after 4 weeks Xenontest do not always confirm those of the EN 152 natural weathering test. Results were influenced by the nature of the formulation, the resin binder and the product combination (treatment system). However the variation among the ageing methods generally does not effect the practical conclusions on the blue stain resistance when well-defined limits are considered.

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