In the Netherlands, window joinery made from non-durable timber species (spruce) are widely protected with preservative rods. These rods contain non-fixing wood preservatives (e.g. bifluorides or boric acid). This reseach was performed to show the possible influence of a coating system to hinder the leaching of the active ingredients. The results of the leaching tests show, that bifluorides and even more boric acid leach out in large quantities from non painted spruce wood. An alkyd paint reduces the emission to the greatest extent but not completely. A small failure in the paint makes severe leaching possible again.

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